Category Archives: Eating disorders
Haematophagia usually refers to the practice of animals feeding on the blood of another species. However, the term has also been applied to humans that consume blood (something that I have referred to in previous blogs on clinical vampirism and menophilia). Most writings on human haematophagia usually refer to the practice in some sexual and/or vampiric capacity (e.g., some individuals in China and Vietnam believe certain types of snake blood are aphrodisiacs and are drunk with rice wine) but haematophagia can also occur for other reasons.
While I working was in Spain, I was taken to one of the best Castilian restaurants, and as part of the starter I was served morcilla sausage. Morcilla sausage is basically a Spanish version of black pudding (aka ‘blood pudding’) and made from pig’s blood. I absolutely loved it. It did make me wonder what other ‘blood’ foods I might enjoy. I did a bit of research into the making of blood sausages and found out that variations of this dish exist in cultures all over the world (e.g., Europe, Asia, and the Americas), and that all kinds of different animals’ blood can be used (including pigs, sheep, cattle, goats, and ducks). According to the Wikipedia entry on human haematophagia:
“Drinking blood and manufacturing foodstuffs and delicacies with animal blood is also a feeding behavior in many societies. Cow blood mixed with milk, for example, is a mainstay food of the African Massai. Some sources say that Mongols would drink blood from one of their horses if it became a necessity. Black pudding is eaten in many places around the world. Some societies, such as the Moche, had ritual hematophagy, as well as the Scythians, a nomadic people of Russia, who had the habit of drinking the blood of the first enemy they would kill in battle…Psychiatric cases of patients performing hematophagy also exist. Sucking or licking one’s own blood from a wound is also a behavior commonly seen in humans, and in small enough quantities is not considered taboo. Finally, human vampirism has been a persistent object of literary and cultural attention”
There a numerous YouTube videos of the African Massai (in Tanzania) drinking blood directly from the necks of live cattle (such as here and here). Cattle blood drinking typically occurs after special celebrations (such as births, ritual circumcisions, etc.), but the special occasions are not compulsory for blood drinking to occur. The cattle are never killed and the cuts made to drink blood from appear to heal quickly. One report on the Environmental Graffiti website described the practice:
“Half a dozen Maasai warriors wrestle with the struggling cow. Another waits with his bow drawn, arrow at the ready. Finally, they have the straining animal in position. The warrior with the weapon shoots straight for the bovine’s jugular. Warm blood gushes into a waiting bucket, pumped out by the animal’s still-beating heart. The blood keeps flowing, almost filling the container, before the cow is released – its punctured neck sealed with a dab of cow dung. It will live to see another day. Its’ blood-donating job is done, at least for another month. The Maasai men who perform this blood-draining ritual do not intend to kill, or even harm, the animal. They merely want some of its nourishing crimson fluid to drink”.
Another Wikipedia entry focusing on blood as food notes that in addition to blood sausages, animal blood has also been used to thicken, colour, and/or flavour sauces and gravies, and for various types of blood soup (such as ‘czernina’ in Poland, ‘papas de sarrabulho’ in Portugal, and ‘svartsoppa’ made with goose blood in Sweden). Although blood is a taboo food in some cultures, in others it is perfectly acceptable – particularly in times when food has been scarce. Other cultures have other blood foods including blood pancakes (in Scandinavian and Baltic countries), blood tofu (China, Thailand, Vietnam), blood cake (Taiwan), blood potato dumplings (‘blodpalt’ made with reindeer blood in Sweden) and blood bread (‘paltbrod’ in Sweden). Additionally, Wikipedia noted that:
“Blood can also be used as a solid ingredient, either by allowing it to congeal before use, or by cooking it to accelerate the process. In Hungary when a pig is slaughtered in the morning the blood is fried with onions and is served for breakfast. In China, ‘blood tofu’ is most often made with pig’s or duck’s blood, although chicken’s or cow’s blood may also be used. The blood is allowed to congeal and simply cut into rectangular pieces and cooked. This dish is also known in Java as saren, made with chicken’s or pig’s blood. Blood tofu is found in curry mee as well as the Sichuan dish, maoxuewang. In Tibet, congealed yak’s blood is a traditional food”.
The Tanzanian Massai people are not the only culture to consume uncooked animal blood products. For instance, Inuits living in the Arctic Circle consume seal blood and believe it to have health and social benefits. According to a paper on consuming seal blood in a 1991 issue of Medical Anthropology Quarterly, seal blood is “seen as fortifying human blood by replacing depleted nutrients and rejuvenating the blood supply, [and] is considered a necessary part of the Inuit diet”. Another academic paper by Dr. Edmund Searles in a 2002 issue of the journal Food and Foodways reported that in relation to the drinking of seal blood: “Inuit food generates a strong flow of blood, a condition considered to be healthy and indicative of a strong body”. Historically, there are accounts of Irish people bleeding cattle as a preventative measure against cattle diseases. The Wikipedia entry on blood as food claims that the Irish mixed the drawn blood with “butter, herbs, oats or meal” to provide a “nutritious emergency food”.
During my research I also came across a story in The Atheist Times (with photographic evidence) of Hindus engaged in the practice of decapitating and drinking goat blood directly from its body (a blood sacrifice). The report claimed the practice was widely prevalent throughout India and Malaysia. These Hindus believe that the Hindu goddess Kali descends upon those drinking the goat’s blood.
Staying on the religious theme, there are (of course) many (arguably ‘mainstream’) simulated acts of haemotphagia – most notably in various religious ceremonies and rituals. The most obvious is in the transubstantiation of wine as the blood of Jesus Christ during Christian Eucharist (where religious followers believe they are drinking the blood of Christ). Various religions engage in such pseudo-haemotophagic practices including the Catholic Church, Eastern Orthodox, Oriental Orthodox, some Anglican, and Lutheran churches. (Other religions are the exact opposite and consider the drinking of blood taboo such as Jewish and Muslim cultures).
As this brief review demonstrates, non-sexual and non-vampiric human haematophagia and pseudo-haematophagia appear to be common and widespread in many cultures and countries. Academic research on the topic appears to be limited although it certainly warrants further investigation.
Dr Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Borré, K. (1991). Seal blood, Inuit blood, and diet: A biocultural model of physiology and cultural identity. Medical Anthropology Quarterly, 5, 48-62.
Davidson, A (2006). The Oxford Companion to Food. Oxford: Oxford University Press.
Searles, E. (2002). Food and the making of modern Inuit identities. Food and Foodways, 10(1-2), 55-78.
Wikipedia (2013). Blood as food. Located at: http://en.wikipedia.org/wiki/Blood_as_food
Wikipedia (2013). Hematophagy. Located at: http://en.wikipedia.org/wiki/Hematophagy
At present, exercise addiction is not officially recognised in any medical or psychological diagnostic frameworks such as the American Psychiatric Association’s Diagnostic and Statistical Manual (DSM) or the World Health Association’s International Classification of Diseases. However, there has been a lot of research into whether exercise can be classed as a bona fide addiction. In spite of the widespread usage of the term ‘exercise addiction’ there are many different terminologies that describe excessive exercise syndrome. Such terms include ‘exercise dependence’, ‘obligatory exercising’, ‘exercise abuse’, and ‘compulsive exercise’. Exercise addiction has been conceptualised as a behavioural addiction. The symptoms and consequences of exercise addiction have often been characterised by six common components of addiction: salience, mood modification, tolerance, withdrawal symptoms, personal conflict, and relapse.
For some people, exercise addiction is a primary problem in the person’s life whereas in others it can be a secondary problem as a consequence of other psychological dysfunctions (like eating disorders such as anorexia nervosa). In the former case, the dysfunction is considered as primary exercise addiction, while in the latter case it is termed as secondary exercise addiction because it co-occurs with another dysfunction. The differentiating feature between the two is that in primary exercise addiction the objective is the exercise itself, whereas in secondary exercise addiction the objective is weight loss, where excessive exercise is one of the primary means in achieving the desired objective.
The incentive or motive for fulfilling planned exercise is an important distinguishing characteristic between addicted and nonaddicted exercisers. The reason people exercise is often for an intangible reward such as feeling in shape, looking good, being with friends, staying healthy, building muscles, losing weight, etc. The personal experience of the anticipated reward reinforces and strengthens the exercise behaviour. Committed exercisers maintain their exercise for benefiting or gaining from their activity and thus, their behaviour is motivated via positive reinforcement. However, empirical research has demonstrated that addicted exercisers have to exercise in order to avoid negative feelings or withdrawal. The individual’s exercise may become a chore that has to be fulfilled, or otherwise an unwanted event would occur (such as the inability to cope with stress, or gaining weight, becoming moody, etc.). Every time a person undertakes behaviour to avoid something negative, bad, and/or unpleasant, the motive behind that behaviour acts as a negative reinforcement. In these situations, the person feels they have to do it rather than wanting to do it.
Mood modification is a key factor among the symptoms of exercise addiction and suggests there is a self-medication aspect of exercise that facilitates the distinction between normal and abnormal exercise. Addicts do not simply exercise to experience the joy of it, but rather to escape negative, unpleasant feelings and everyday difficulties.
The Exercise Addiction Inventory is one of the most recent and most widely used screening tools in the research area of exercise addiction, primarily because of its brevity and excellent psychometric properties (i.e., reliability and validity). The EAI comprises only six statements, each corresponding to one of the symptoms in the ’components’ model of addiction. Each statement is rated on a 5-point Likert scale ranging from 1 (strongly disagree) to 5 (strongly agree). The EAI cut-off score for individuals considered at-risk of exercise addiction is 24 out of 30. To date, the only nationally representative study examining exercise addiction is a study that I co-authored with some Hungarian colleagues. We surveyed over 2,700 Hungarian adults aged 18–64 years and assessed exercise addiction using the EAI. Results showed that the proportion of the people at risk for exercise addiction was 0.5%.
There are numerous theories that deal with both the causes of exercise addiction and the process and mechanisms of its development and maintenance. A significant number of psychological theories are based on learning theory or the cognitive psychology approach. According to the theory of functioning, both positive reinforcers (e.g., a feeling of euphoria following exercise or muscle growth from exercise) and negative reinforcers (e.g. an end to unpleasant feelings through exercise or avoidance of the presumed negative effect of missed exercise) may lie behind the development and maintenance of exercise addiction which, according to the fundamental principles of learning theory, may contribute to the establishment of compulsive and addictive exercise that may be viewed as maladaptive.
One of my research colleagues, Dr. Attila Szabo stresses the role of cognitive appraisal mechanisms in the development of the vicious cycle that leads to excessive exercise. The process starts when the habitual exerciser uses exercise as a means of coping with stress, and the affected individual learns to depend on exercise at times of stress. The addicted exerciser is then trapped in a vicious cycle of needing increased amounts of exercise to deal with the consistently increasing life stress, part of which is caused by exercise itself.
It also appears that the issue of self-assessment represents a further significant factor among the psychological factors in the sense that during exercise, the physical strength experienced through exercise in a person dissatisfied with his or her body or body image contributes to the formation of a more positive self-image and self-assessment. It has also been shown that exercise activities (such as weightlifting) have a positive effect on body image and self-esteem both in men and in women. Perfectionism, obsessive-compulsive functioning, and heightened anxiety have also been claimed to be determining factors in exercise addiction.
The public promotion of healthy and appropriate exercise patterns may reduce the incidence of exercise addiction. It is important in public health programs and campaigns to (i) stress the healthy nature of regular exercise and (ii) communicate the message that exercise when taken to excess can be potentially harmful. It is important to raise awareness of potential harm within the population of regular exercisers. Some psychologists claim that individuals with exercise addiction have a poor understanding of the negative health consequences of excessive exercising, of the mechanism of exercise adaptation, and the need for rest between exercise sessions. The use of education may be an effective step in the prevention and treatment of exercise addiction.
As with other addictive disorders, the environment of regular exercisers also plays a significant role in recognising this condition early. In more severe cases psychotherapeutic interventions may be needed. When treating exercise addiction, abstinence from exercise may not be a required and/or realistic goal, because exercise has many benefits for health and no one would advocate doing no exercise. Therefore, the typical treatment goal would more likely be be to return to moderate and controlled exercise. In some cases, a different form of exercise may be recommended.
Joanna is a 25-year old student, well-educated female, from a stable family background, who realized that she had a problem surrounding exercise, and more specifically the martial art Jiu-Jitsu. Here, Joanna’s behavior is described in terms of the main components of addiction:
- Salience: Jiu-Jitsu is the most important activity in Joanna’s life. Even when not actually engaged in the activity, she is thinking about the next training session or competition. She estimates that she spends approximately six hours a day (and sometimes much more) involved in training (e.g., weight training, jogging, general exercise, etc.).
- Tolerance: Joanna started Jiu-Jitsu at an evening class once a week during her teenage years and built up slowly over a period of about five years. She now exercises every single day, and the lengths of the sessions have become longer and longer (suggesting tolerance).
- Withdrawal: Joanna claims she becomes highly agitated and irritable if she is unable to exercise. She claims she also gets headaches and feels nauseous if she goes for more than a day without training or has to miss a scheduled session.
- Mood modification: Joanna experiences mood changes in a number of ways. She feels very high and ‘buzzed up’ if she has done well in a Jiu-Jitsu competition (especially so if she wins). She also feels high if she has trained hard and for a long time.
- Conflict: Joanna’s relationship with her long-term partner ended as a result of her exercise. She claimed she never spent much time with him and was not even bothered about their break-up. Her university work suffered because of the lack of time and concentration.
- Loss of control: Joanna claims she cannot stop herself engaging in exercise when she “gets the urge”. Once she has started, she has to do a minimum of a few hours of exercise.
- Relapse: Joanna has continually tried to stop and/or cut down but claims she cannot. She becomes highly anxious if she is unable to engage in exercise and then has to go out and train to make herself feel better. She is well aware that exercise has taken over her life but feels powerless to stop it.
- Negative consequences: Joanna spends money beyond her means to maintain her exercising habit (e.g., on entrance fees for weight training, swimming, entrance fees enter Jiu-Jitsu tournaments across the country, etc.). She has resorted to socially unacceptable means (e.g., stealing) in order to get money to fund herself
In short, exercise is the most important thing in Joana’s life, and the number of hours engaged in physical activity per week has increased substantially over a five-year period. She displays withdrawal symptoms when she does not exercise, and experiences euphoric experiences related to various aspects of her exercising (e.g., training hard, winning competitions, etc.). She experiences conflict over exercise in many areas of her life and acknowledges she has a problem. Furthermore, she has lost friends, her relationship has broken down, her academic work has suffered, and she has considerable debt.
Note: An expanded version of this article was first published by Rehabs.com
Dr. Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Allegre, B., Souville, M., Therme, P., & Griffiths, M.D. (2006). Definitions and measures of exercise dependence, Addiction Research and Theory, 14, 631-646.
Allegre, B., Therme, P., & Griffiths, M. D. (2007). Individual factors and the context of physical activity in exercise dependence: A prospective study of ‘ultra-marathoners’. International Journal of Mental Health and Addiction, 5, 233-243.
Berczik, K., Szabó, A., Griffiths, M. D., Kurimay, T., Kun, B., Urbán, R., & Demetrovics, Z. (2012). Exercise addiction: symptoms, diagnosis, epidemiology, and etiology. Substance Use and Misuse, 47, 403-417.
Downs, D. S., Hausenblas, H. A., & Nigg, C. R. (2004). Factorial validity and psychomaetric examination of the Exercise Dependence Scale-Revised. Measurement in Phisical Education and Exercise Science, 8, 183-201.
Griffiths, M. (1997). Exercise addiction: A case study. Addiction Research, 5, 161-168.
Griffiths, M. D., Szabo, A., & Terry, A. (2005). The exercise addiction inventory: a quick and easy screening tool for health practitioners. British Journal of Sports Medicine, 39, e30-31.
Hausenblas H. A., & Downs, S. D. (2002a) Exercise dependence: a systematic review. Psychology of Sport Exercise, 3, 89-123.
Hausenblas, H. A., & Downs, S. D. (2002). How much is too much? The development and validation of the exercise dependence scale. Psychology and Health, 17, 387-404.
Mónok, K., Berczik, K., Urbán, R., Szabó, A., Griffiths, M.D., Farkas, J., Magi, A., Eisinger, A., Kurimay, T., Kökönyei, G., Kun, B., Paksi, B. & Demetrovics, Z. (2012). Psychometric properties and concurrent validity of two exercise addiction measures: A population wide study in Hungary. Psychology of Sport and Exercise, 13, 739-746.
Sussman, S., Lisha, N., & Griffiths, M. D. (2011). Prevalence of the addictions: A problem of the majority or the minority? Evaluation and the Health Professions, 34, 3-56.
Szabo, A. (2000). Physical activity as a source of psychological dysfunction. In S. J. Biddle, K. R. Fox & S. H. Boutcher (Eds.), Physical Activity and Psychological Well-Being (pp. 130-153). London: Routledge.
Szabo, A., & Griffiths, M. D. (2007). Exercise addiction in British sport science students. International Journal of Mental Health and Addiction, 5, 25-28.
Terry, A., Szabo, A., & Griffiths, M. (2004). The exercise addiction inventory: a new brief screening tool. Addiction Research and Theory, 12, 489-499.
In a previous blog I briefly examined clinical vampirism as a sexual paraphilia. In that blog I noted that there had been very little empirical research on clinical vampirism and that most of what is known comes from clinical case studies. Furthermore, vampirism (i) is rarely a single clinical condition, (ii) may or may not be associated with other psychiatric and/or psychological disorders (e.g., severe psychopathy, schizophrenia, hysteria, mental retardation), and (iii) may or may not necessarily include sexual arousal. Other related conditions include odaxelagnia (deriving sexual pleasure from biting), haematolagnia (deriving sexual satisfaction from the drinking of blood), and haematophilia (deriving sexual satisfaction from blood in general), and auto-haemofetishism (i.e., deriving sexual pleasure from sight of blood drawn into a syringe during intravenous drug practice).
More recently I was contacted by a female ‘vampire’ (I use the term lightly in this instance) who has read my original article wanted to share her story with me. She gave me permission to disseminate her story with my blog readers on the understanding that I guaranteed her anonymity, confidentiality, and used her preferred name of ‘Countess Maria’ (CM) throughout the article. (She also signed herself as ‘The Young Madam’ but I will use CM for the remainder of this article). Obviously, I have no way of verifying anything that CM communicated to me, but on a personal level I have no reason to doubt the veracity of her claims. All of our communication was via email under her real name (which I then checked out online on a specific social networking site and I am 100% sure that she is who she says she is). She also said she “would be honored to have you feature my story. I have answered your questions…as I honor your intellect and respect…being a professor is indeed a respectable, hardy, and challenging profession which is why I greatly respect an honor such profession”. More specifically, she added:
CM: “Whom I share this information must take it to the grave with them; except for you. You may share my story if and only if you use my name I have used for years ‘Countess Marie’. I do indeed consider myself a Countess due to what I have endured through humanitarian efforts as well as my ever strong want, need, and desire to help humanity – even if humanity shuns me for who I am”.
I asked CM for some socio-demographic information and she told me that she was 23 years of age, described herself as an African American and was currently employed as a Pharmacy Technician. Based on what she told me, she was well educated with various medical qualifications including Pharmacy Technician and Animal Care Certification. I also asked her about her religious beliefs and she responded: “Christian with great noble intent (‘I will gladly share my last piece of bread with my fellow man’). I live by that statement and I intend to follow through”. She also went ion to say: “I am finally in my studied job, as a Pharmacy Technician. I have always had a thing for helping people…this is just one if the many ways I can help. My dream in life is to be a great humanitarian and grow to greatness in helping those around me…I love who I am, and I am always wanting to follow my path.
In her account, CM didn’t really label herself a vampire but admitted that she liked drinking blood, and that many of the acts she engaged in would be labelled as vampire-like by others. She also talked about her first experiences of blood-sucking:
CM: “It is my understanding that you wish to hear about my further expansion on my clinical vampirism. Truthfully, I don’t really put a label on what it is I do. I have been consuming blood since I was young. The first cut I ever got was from a tree branch. I sucked my arm for several hours because the taste was delicious”.
At that point, CM didn’t really view her activity as in any way wrong but over time she began to realize that blood sucking was not considered normal behaviour and that she was socially ostracized by those who knew about her love of blood:
CM: “As I furthered in age through the years I noticed that I was considered different and odd, but I kept to myself about it. My love, my best friends, and you are the only people to know I consume blood…I would also like to add I have been called everything in the book for consuming blood; Monster, Demon, Grim’s Helper, and all the names in the middle…[Even] my friends called me [these things] at first because they did not understand what it mean for me”
However, CM went to great lengths to tell me that her love of blood did not involve the sucking of blood from other humans:
CM: “Make no mistake…I have never consumed blood from any human being – [only] myself. I consume pork blood, beef blood, and if that cannot be obtained I buy steaks and cook them very rare just enough for blood to spill out of it. I enjoy eating food, but it’s not really fun if it lacks in my nutrition. I add blood to juice, tea, desserts, cakes, salads, and disguise it in all sorts of ways”.
CM claimed she would never do anything that impacted on other humans and that morally it would be wrong to enforce her own beliefs and desires on others. She also believes that blood consumption is what keeps her alive:
“I never feed anyone else my blood food. I cook human food properly for guests for I know I am the only one who enjoys the taste of blood. To many, it is bitter and irony-metallic tasting. I cannot relate, due to the fact that for me, it tastes like fine wine. Without blood, I know that I would surely die. I need blood to live. I have always felt that way. Nothing on Earth will ever change my thoughts on the matter. I love blood…To me blood is life or death”.
CM also told me she had been diagnosed with anemia and I asked her whether believed that her love of blood may be because she has anemia:
“I will always love blood. I know that as far as my health goes, it actually favors blood consumption. I was told I almost died by slowly falling into a coma from sleeping for almost 4 straight days. The entire time I was asleep it only felt like seconds, but when I awoke, everyone was worried…I was diagnosed with being anemic, as well as hyperthyroidism. My hyperthyroidism is such [that] I will be on Levothyroxin until the day I die. My blood naturally lacks the iron (due to being anemic) so consuming blood helps me in many ways…I feel that my anemia further shows me that when I feel dizzy or “off centered” that I should consume blood. I only consume pig or beef blood…NEVER human blood”.
As she had read my article clinical vampirism as a sexual paraphilia I also asked CM if her consuming of blood was in any way sexually motivate. She responded by saying:
“The sight of blood is a turn on for me, but only inside of a container. If someone is bleeding of course I would help aid them and stop the pain. If I see frozen blood in the grocery store or walk in the meat section at the market for too long, all I can smell is the blood, which causes arousal for me. I don’t stay in butcher shops long for that reason”.
This suggests that blood for CM (in some circumstances) is sexually arousing and that there may be paraphilic elements in her reason for liking blood. Whether CM is typical of other ‘vampires’ is not clear. But given the little we know about people that love drinking blood, I am grateful to CM for her time in answering my questions and her honesty in relation to the development and motivations underpinning her hobby.
Dr. Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
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A couple of weeks ago I wrote a blog on why problem gambling should be considered a health issue. Earlier this week, I came across an interesting study carried out by jackpot.co.uk who surveyed 2,131 online gamblers (58% males and 42% female) about their health. After the self-reported data had been collected, the gamblers were classed into one of nine categories based on the casino game type that the gambler played most often (i.e., slot machines, video poker, blackjack, roulette, dice/craps, baccarat, poker, pai gow, and ‘other’). The data were then tabulated so that all the health variables (including obesity) corresponded to the gambler’s preferred casino game.
I was interested in the findings not only because I am a Professor of Gambling Studies, but also because I was a member of the Department of Health’s ‘Expert Working Group on Sedentary Behaviour, Screen Time and Obesity’ (a reference to our final report to the British government can be found in the ‘Further Reading’ section below). The study took an objective measurement of physical condition by asking each gambler their height (centimetres) and their weight (kilograms) to calculate each person’s Body Mass Index (BMI) by dividing the gamblers’ weight by height (metres) and dividing by height again (for example, someone who weighs 80kg and is 180cm tall, the BMI is 24.1 as this is 80/1.80)/1.80). The survey then asked s few general health and lifestyle questions (similar to ones that we have used in the last few British Gambling Prevalence Surveys:
- Do you normally drink more than the recommended limit for weekly alcohol consumption (21 units of alcohol for men and 14 for women)? (Yes/No)
- Do you smoke regularly? (Yes/No)
- Do you normally engage in at least 30 minutes of physical activity, 5 times per week? (Yes/No)
Overall, the survey found that British casino gamblers as a group were no less healthy than the rest of the British population, with an average Body Mass index (BMI) of 27 (which is the same as the UK national average). However, the survey also reported that the average BMIs, health, and lifestyle choices (such as smoking cigarettes, engaging in exercise, and drinking alcohol varied considerably depending on the casino games that the respondents played. Here are some of the main findings:
- Slots players were the least healthy. They took less exercise and had an average BMI of 31, pushing them into the category of obese (which is linked to increased chance of developing illnesses such as Type 2 diabetes and reduced life expectancy)
- Roulette, blackjack, video poker and craps/dice players were not far behind slots players, each having BMI levels higher than the national average.
- Those that played poker, baccarat and Pai Gow had an average BMI of 25 or under (well within the normal range recommended by the World Health Organisation.
- Whilst drinking levels might be reasonably high among poker players, they were very exercise conscious, with 58% engaging in physical activity for at least 30 minutes, five times a week. For slots players the figure was 27% meeting this government recommended target.
- Overall slots players drink the most, with 24.1% drinking over the recommended weekly limit. Poker players are not far behind on 23%. Female slots players were the biggest drinking subgroup, closely followed by male poker players.
- Slots players also smoked more, with 24% being regular smokers (compared to the UK national average of 20%). Blackjack and roulette players smoked slightly more than average, on 21% and 22% respectively, while poker players smoked slightly less than average, on 19.5%.
None of these results is overly surprising as there are many studies (including my own) showing comorbidity between gambling and other potentially addictive behaviours. However, very few academic studies have ever looked at these health variables by game type. Although this was not an academic study, the results will likely be of interest to those in the gambling studies field.
The survey also examined the most common platform on which the gamblers played casino games. The most common was the desktop computer (65%), followed by mobiles and tablets (20%) and land-based casinos (14%). This is not surprising given the survey was completed by online gamblers. Interestingly, desktop use was linked to higher levels of obesity, drinking and smoking. This is something that I would expect given that online gambling is the most sedentary of these activities.
There are (of course) some limitations with the data collected particularly as it comprised a self-selected sample of online gamblers that played via jackpot.co.uk websites. We have no idea as to whether the sample is representative of all online gamblers but as I noted above, it is no surprise that online gamblers preferred playing casino games online compared to offline (i.e., land-based casinos). The data were also self-report and are therefore open to any number of individual biases including recall biases and social desirability biases. Also, we have no geographical breakdown of the sample as the internet (by definition) is global. However, the sample size is good in comparison to many published studies on gambling and the sample included individuals that were actually gamblers (as opposed to university undergraduates or members of the general public). According to Sam Marsden (editor of jackpot.co.uk and author of the report):
“There’s an undeniable link connecting passive games like slots and video poker to unhealthy, sedentary lifestyles. On the other hand, games that require concentration, strategy and some physical stamina like poker and blackjack seem to fare much better in the health stakes. It seems it’s less a case of ‘you are what you eat’ and more ‘you are what you play’.”
Although such a conclusion could be argued to be PR spin on the findings, the results suggest that more rigorous studies could be carried out in the area including secondary analyses of the robust datasets that already exist including the British Gambling Prevalence Surveys, the English Health Surveys, and the Scottish health Surveys.
Dr. Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Biddle, S., Cavill, N., Ekelund, U., Gorely, T., Griffiths, M.D., Jago, R., et al. (2010). Sedentary Behaviour and Obesity: Review of the Current Scientific Evidence. London: Department of Health/Department For Children, Schools and Families (126pp).
Griffiths, M.D. (2001). Gambling – An emerging area of concern for health psychologists. Journal of Health Psychology, 6, 477-479.
Griffiths, M.D. (2004). Betting your life on it: Problem gambling has clear health related consequences. British Medical Journal, 329, 1055-1056.
Griffiths, M.D. (2007). Gambling Addiction and its Treatment Within the NHS. London: British Medical Association (ISBN 1-905545-11-8).
Griffiths, M.D., Wardle, J., Orford, J., Sproston, K. & Erens, B. (2010). Gambling, alcohol consumption, cigarette smoking and health: findings from the 2007 British Gambling Prevalence Survey. Addiction Research and Theory, 18, 208-223.
Griffiths, M.D., Wardle, J., Orford, J., Sproston, K. & Erens, B. (2011). Internet gambling, health. Smoking and alcohol use: Findings from the 2007 British Gambling Prevalence Survey. International Journal of Mental Health and Addiction, 9, 1-11.
Marsden, S. (2014). Booze, bets, and BMI. Jackpot.co.uk, October 6. Located at: http://www.jackpot.co.uk/online-casino-articles/booze-bets-bmi
Rigbye, J. & Griffiths, M.D. (2011). Problem gambling treatment within the British National Health Service. International Journal of Mental Health and Addiction, 9, 276-281.
Wardle, H., Griffiths, M.D., Orford, J., Moody, A. & Volberg, R. (2012). Gambling in Britain: A time of change? Health implications from the British Gambling Prevalence Survey 2010. International Journal of Mental Health and Addiction, 10, 273-277.
Wardle, H., Moody. A., Spence, S., Orford, J., Volberg, R., Jotangia, D., Griffiths, M.D., Hussey, D. & Dobbie, F. (2011). British Gambling Prevalence Survey 2010. London: The Stationery Office.
Wardle, H., Seabury, C., Ahmed, H., Payne, C., Byron, C., Corbett, J. & Sutton, R. (2014). Gambling behaviour in England and Scotland: Findings from the Health Survey for England 2012 and Scottish Health Survey 2012. London: NatCen.
Wardle, H., Sproston, K., Orford, J., Erens, B., Griffiths, M. D., Constantine, R., & Pigott, S. (2007). The British Gambling Prevalence Survey 2007. London: National Centre for Social Research.
In previous blogs I have looked at pica (i.e., the eating of non-nutritive items or substances) and subtypes of pica such as geophagia (eating of soil, mud, clay, etc.), pagophagia (eating of ice), acuphagia (eating of metal), and coprophagia (eating of faeces). It wasn’t until I started to research on specific sub-types of pica, that I discovered how many different types of non-food substances had been identified in the academic and clinical literature. For instance, Dr. V.J. Louw and colleagues provided a long list in a 2007 issue of the South African Medical Journal including cravings for the heads of burnt matches (cautopyreiophagia), cigarettes and cigarette ashes, paper, starch (amylophagia), crayons, cardboard, stones (lithophagia), mothballs, hair (trichophagia), egg shells, foam rubber, aspirin, coins, vinyl gloves, popcorn (arabositophagia), and baking powder. Most of these are generally thought to be harmless but as Louw and colleagues note, a wide range of medical problems have been documented:
“These include abdominal problems (sometimes necessitating surgery), hypokalaemia, hyperkalaemia, dental injury, napthalene poisoning (in pica for toilet air-freshener blocks), phosphorus poisoning (in pica for burnt matches), peritoneal mesothelioma (geophagia of asbestos-rich soil), mercury poisoning (in paper pica), lead poisoning (in dried paint pica and geophagia), and a pre-eclampsia-like syndrome (baking powder pica)”.
In the clinical literature, the eating of paper has been occasionally documented (although anecdotal evidence suggests this is fairly common and I remember doing it myself as a child). A recent review paper on pica by Dr. Silvestre Frenk and colleagues in the Mexican journal Boletín Médico del Hospital Infantil de México highlighted dozens of pica-subtypes and created many new names for various pica sub-types. They proposed that people who eat paper display ‘papirophagia’ (in fact if you type ‘papirphagia’ into Google, you only get one hit – the paper by Silvestre and colleagues – although this blog may make it two!). Eating paper is not thought to be particularly harmful although I did find a case of mercury poisoning because of ‘paper pica’ (as the authors – Dr. F. Olynk and Dr. D. Sharpe – called it) in a 1982 issue of the New England Journal of Medicine.
One sub-type of papirophagia is the eating of toilet paper. As far as I am aware, there is only one case study in the literature and this was published back in 1981, Dr. J. Chisholm Jr. and Dr. H. Martín in the Journal of the National Medical Association. They described the case of a 37-year old black woman with an “unusually bizarre craving” for toilet tissue paper. The authors reported that:
“[The] woman was referred for evaluation of disturbed smell and loss of taste for over one year. These were associated with chronic fatigue and listlessness. During this same period of time, she rather embarrassedly admitted to an overwhelming desire to eat toilet tissue. Frequently, she would awaken at night and dash to her bathroom to eat toilet tissue. No other type(s) of pica were admitted. In addition, she gave a long history of menorrhagia and frequently passed vaginal blood clots during her menses. Her libido was normal and there was no history of poor wound healing, skin or mucous membrane lesions, or intestinal symptoms. Her dietary history suggested a high carbohydrate diet, and due to a mild exogenous obesity she intermittently resorted to a vegan-like diet that included beans and various seeds”
A variety of medical tests were carried out and she was diagnosed with combined iron and zinc deficiency. She was treated with iron and zinc tablets and within a week, both her taste and smell had returned, and her energy levels greatly improved. Zinc deficiencies can lead to a wide variety of clinical disorders including loss of small and taste, anorexia, dwarfism (i.e., growth retardation), impaired wound healing, and geophagia. The woman’s (sometimes) vegan diet may have been to blame for her zinc deficiency as the authors noted that:
“Although vegetables contain zinc, vegans should be made aware that zinc from plant sources is not readily absorbed because naturally occurring phytates, particularly high in beans and seeds, reduce zinc gastrointestinal absorption. Carbohydrates are very poor sources of zinc. Chronic iron deficiency secondary to chronic menorrhagia accounts well for the anemia, fatigue, and unusual pica for toilet tissue noted in this patient”.
Paper pica has occasionally been mentioned in other academic papers although details have typically been limited. For instance, a 1995 paper in the journal Birth by Dr. N.R. Cooksey on three cases of pica in pregnancy reported that one of the women chewed non-perfumed blue toilet paper during the first trimester of her pregnancy (and was forced by her mother to stop). There was also a 2003 paper published by Dr. Dumaguing in the Journal of Geriatric Psychiatry and Neurology examining pica in mentally ill geriatrics. One of the cases mentioned was a 76-year old patient that not only ingested their medication (an emollient cream for arthritis) but was also recorded eating toilet paper, napkins, Styrofoam cups, crayons, and other patients’ medications.
A more recent 2008 paper by Dr. Sera Young and her colleagues in the journal PLoS ONE, critically reviewed procedures and guidelines for interviews and sample collection in relation to pica substances. In describing the protocols involved, they referred to paper pica in the questions that should be asked:
“What is the local name, brand name, or type of pica substance desired or consumed? This will help others to know if this substance has already been studied and assist interested researchers in obtaining subsequent samples at a later date. Furthermore, different manufactured products may contain different materials, e.g. Crayola chalkboard chalk contains slightly different ingredients from other brands. Similarly, the consequences of toilet tissue paper consumption are different from those of eating pages of a novel; information would be lost if the substance was simply described as paper. For these reasons, the substance consumed should be described in as much detail and as accurately as possible”.
Personally (and based on anecdotal evidence), I think that papirophagia is not overly rare (especially among children – although I admit this may be more out of curiosity that craving) but the clinical literature suggests that it is a fairly rare disorder found amongst distinct sub-groups (pregnant women, the mentally ill). Given the fact that for most people eating paper would not cause any problems, this would provide the main reason why so few cases end up seeking medical, clinical, and/or psychological help.
Dr Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Chisholm Jr, J. C., & Martín, H. I. (1981). Hypozincemia, ageusia, dysosmia, and toilet tissue pica. Journal of the National Medical Association, 73(2), 163-164.
Cooksey, N.R. (1995). Pica and olfactory craving of pregnancy: How deep are the secrets? Birth, 22, 129-137.
Dumaguing, N.I., Singh, I., Sethi, M., & Devanand, D.P. (2003). Pica in the geriatric mentally ill: unrelenting and potentially fatal. Journal of Geriatric Psychiatry and Neurology, 16, 189-191.
Frenk, S., Faure, M.A., Nieto, S. & Olivares, Z. (2013). Pica. Boletín Médico del Hospital Infantil de México, 70(1), 55-61
Louw, V.J., Du Preez, P., Malan, A., Van Deventer, L., Van Wyk, D., & Joubert, G. (2007). Pica and food craving in adults with iron deficiency in Bloemfontein, South Africa. South African Medical Journal, 97, 1069-1071.
Olynyk, F., & Sharpe, D. H. (1982). Mercury poisoning in paper pica. The New England Journal of Medicine, 306, 1056 -1057.
Young, S.L., Wilson, M.J., Miller, D., Hillier, S. (2008). Toward a comprehensive approach to the collection and analysis of pica substances, with emphasis on geophagic materials. PLoS ONE, 3(9), e3147. doi:10.1371/journal.pone.0003147
Muscle Dysmorphia (MD) describes a condition characterised by a misconstrued body image in individuals interpret their body size as both small and weak even though they may look normal or even be highly muscular. Those experiencing the condition typically strive for maximum fat loss and maximum muscular build. MD can have potentially negative effects on thought processes including depressive states, suicidal thoughts, and in extreme cases, suicide attempts. These negative psychological states have also been linked with concurrent use of Appearance and Performance Enhancing Drugs (APED) including Anabolic Androgenic Steroids (AAS).
MD was originally categorised in 1993 by Dr. H.G. Pope and colleagues (in the journal Comprehensive Psychiatry) as Reverse Anorexia Nervosa, due to characteristic symptoms in relation to body size. It has been considered to be part of the spectrum of Body Dysmorphic Disorders (BDD) referring to a range of conditions that tap into issues surrounding body image and eating behaviours. Consequently, there is a lack of consensus amongst researchers whether MD is a form of BDD, Obsessive-Compulsive Disorder (OCD) or a type of eating disorder. Earlier this year, Andy Foster, Dr. Gillian Shorter and I published a paper in the Journal of Behavioral Addictions about the ‘Addiction to Body Image’ model, and arguing that MD could perhaps be conceptualized as an addiction.
Our ‘Addiction to Body Image’ (ABI) model attempts to provide an operational definition and to introduce a standard assessment across the research area. The ABI model uses my addiction components model (outlined is a previous blog) as the framework in which to define muscle dysmorphia as an addiction. For the purposes of our paper, body image was defined using Sarah Grogan’s definition (from her 2008 book Body image: Understanding body dissatisfaction in men, women, and children) who said it was a person’s “perceptions, thoughts and feelings about his or her body”. We argued that the addictive activity in MD is the maintaining of body image via a number of different activities such as bodybuilding, exercise, eating certain foods, taking specific drugs (e.g., anabolic steroids), shopping for certain foods, food supplements, and/or physical exercise accessories, etc.).
In the ABI model, the perception of the positive effects on the self-body image is accounted for as a critical aspect of the MD condition. The maintenance behaviours of those with ABI may include healthy changes to diet or increases in exercise. However, such behaviours can hide or mislead those with ABI away from the negative thought processes that are driving their addiction. It is in the cognitive dysfunction of MD where we believe there is a pathological issue, and why the field has encountered problems with the criteria for the condition. The attempt to explain MD in the same manner as other BDDs may not be adequate due to the cognitive dysfunction occurring in the context of the potentially positive physical effects via improvements in shape, tone, and/or health of the body.
We also argued that there is a difference in the cognitive dysfunction with a misconstrued self-body image compared to other BDDs. The cognitive dysfunction causes the individual with MD to have a misconstrued view of their own body image, and the person believes they are small and puny. This negative mindset has the potential to cause depression and other disorders, and may facilitate the addiction. Unlike other conceptualizations of MD in the BDD literature, we would argue that the agent of the addiction is the perceived body image that is maintained by engaging in secondary behaviours such as specific types of physical activity and food. The most important thing in the life of someone with MD is how their body looks (i.e., their body image). The behaviours that the person with MD engages in (such as excessive exercise or disordered eating) are merely the vehicles by which their addiction (i.e., their perceived body image) is maintained.
Based on empirical evidence to date, we proposed that Muscle Dysmorphia could be re-classed as an addiction due to the individual continuing to engage in maintenance behaviours that cause long-term psychological damage. More research is needed to explore the possibilities of MD as an addiction, and how this particular addiction is linked to substance use and/or other comorbid health conditions. Controversy about the conceptual measurement of the condition, has led to a number of different scales adapted from different criteria that may not fully measure the experience of MD.
However, a group of questions that might test the applicability of the ABI approach to measuring and conceptualising MD have not been asked. Questionnaires such as the Exercise Addiction Inventory and the Bergen Work Addiction Scale (two scales that I co-developed) could be adapted to fit MD characteristics. Adequate conceptualisation is key to explore the clinically relevant condition. This new ABI approach may also have implications for diagnostic systems around similar conditions such as other BDDs or eating disorders.
Dr Mark Griffiths, Professor of Gambling Studies, International Gaming Research Unit, Nottingham Trent University, Nottingham, UK
Additional input: Andy Foster and Dr. Gillian Shorter
Andreassen, C.S., Griffiths, M. D., Hetland, J. & Pallesen, S. (2012). Development of a Work Addiction Scale. Scandinavian Journal of Psychology, 53, 265-272.
Foster, A.C., Shorter, G.W.& Griffiths, M.D. (2014). Muscle Dysmorphia: Could it be classified as an Addiction to Body Image? Journal of Behavioral Addictions, in press.
Griffiths, M.D. (1997). Exercise addiction: A case study. Addiction Research, 5, 161-168.
Griffiths, M. D. (2005). A ‘components’ model of addiction within a biopsychosocial framework. Journal of Substance Use, 10, 191-197.
Griffiths, M. D., Szabo, A., & Terry, A. (2005). The Exercise Addiction Inventory: A quick and easy screening tool for health practitioners. British Journal of Sports Medicine, 39, 30-31.
Grogan, S. (2008). Body image: Understanding body dissatisfaction in men, women, and children. London: Routledge.
Mosley, P.E. (2009). Bigorexia: Bodybuilding and muscle dysmorphia. European Eating Disorders Review. 17, 191-198.
Murray, S. B., Rieger, E., Touyz, S. W., & De la Garza Garcia, Y. (2010). Muscle Dysmorphia and the DSM-V Conundrum: where does it belong? International Journal of Eating Disorders, 43, 483-491.
Nieuwoudt, J. E., Zhou, S., Coutts, R. A., & Booker, R. (2012). Muscle dysmorphia: Current research and potential classification as a disorder. Psychology of Sport and Exercise, 13, 569-577.
Olivardia, R. (2001). Mirror, mirror on the wall, who’s the largest of them all? The features and phenomenology of muscle dysmorphia. Harvard Review of Psychiatry, 9, 254–259.
Phillips, K. A. & Hollander, E. (1996). Body dysmorphic disorder.In T.A. Widige, A.J. Frances, H.A. Pincus, R. Ross, M.B. First, & W.W. Davis, Eds. DSM-IV Sourcebook, Volume 2. Washington DC: American Psychiatric Association.
Philips, K. A., Gunderson, C. G., Mallya, G., McElroy, S. L., & Carter, W. (1998). A comparison study of body dysmorphic disorder and obsessive-compulsive disorder. Journal of Clinical Psychiatry, 59, 568–575.
Pope, H. G., Jr., Gruber, A. J., Choi, P., Olivardia, R., & Phillips, K. A. (1997). Muscle dysmorphia. An underrecognised form of body dysmorphic disorder. Psychosomatics, 38, 548–557.
Pope, H. G., Jr., Katz, D. L., & Hudson, J. I. (1993). Anorexia nervosa and ‘‘reverse anorexia’’ among 108 male bodybuilders. Comprehensive Psychiatry, 34, 406–409.
Pope, C. G., Pope, H. G., Menard, W., Fay, C., Olivardia, R., & Phillips, K.A. (2005). Clinical features of muscle dysmorphia among males with body dysmorphic disorder. Body image, 2, 395-400.
Veale, D. (2004) Body dysmorphic disorder. Postgraduate Medical Journal. 80, 67-71.
In a previous blog on five ‘weird addictions’ I briefly mentioned pagophagia, a craving and compulsion for chewing ice. Pagophagia is a type of pica (which I also covered in a previous blog). Pica is defined as the persistent eating of non-nutritive substances for a period of at least one month, without an association with an aversion to food. Although the incidence of pagophagia appears to have increased over the last 30 years in westernized cultures, Dr. B. Parry-Jones (in a 1992 issue of Psychological Medicine) carried out some historical research and pointed out that both Hippocrates and Aristotle wrote about the dangers of excessive intake of iced water. Parry-Jones also noted that references to disordered eating of ice and snow were also recorded in medical textbooks from the sixteenth century. However, the first contemporary reference to pagophagia appears to have been a 1969 paper by Dr. Charles Coltman in the Journal of the American Medical Association entitled ‘Pagophagia and iron lack’.
Pagophagia is closely associated with iron deficiency anemia but can also be caused by other factors (biochemical, developmental, psychological, and/or cultural disorders). If pagophagia is due to iron deficiency (such as case studies of those with sickle cell anemia), it may sometimes be accompanied by fatigue (e.g., being tired even when performing normally easy tasks). Dr. Youssef Osman and his colleagues published a number of case reports of pagophagia in a 2005 issue of the journal Pediatric Haematology and Oncology including the case of a child with sickle cell anemia and rectal polyps (that caused a lot of bleeding and made the anemia worse):
“An 8-year-old Omani boy, a known case of sickle cell anemia…presented with history of craving for ice. The child was noticed over the last 4 months to like drinking very cold water and to open the deep freezer and scratch the ice and eat it. The parents tried to stop him from doing so, but they failed…The child was started on oral iron therapy…and his craving for ice was completely stopped. Meanwhile, the rectal polyp was removed surgically”.
Other potential health side effects include constant headaches (a ‘brain freeze’ similar to ‘ice cream headache’) and teeth damage although this is thought to be relatively rare. However, a recent paper by Dr. Yasir Khan and Dr. Glen Tisman in the Journal of Medical Case Reports highlighted the case of a 62-year-old Caucasian man who presented with bleeding from colonic polyps associated with drinking partially frozen bottled water.
Khan and Tisman also suggested that some people who are deficient in iron experience tongue pain and glossal inflammation (glossitis). Others claim that chewing ice may help those with stomatitis (i.e., inflammation of the mucous lining inside the mouth). A recent 2009 case study published by Dr. Tsuyoshi Hata and his colleagues in the Kawasaki Medical Journal, reported the case of a 37-year old Japanese women who ate copious amounts of ice to relieve the pain of temporomandibular joint disorder (i.e., chronic pain in the joint that connects the jaw to the skull). Khan and Tisman also claim that the classical symptoms of pagophagia have changed in the last 40 years since Dr. Coltman’s initial paper in the Journal of the American Medical Association.
“This may probably be the result of advances in technology and changes in culture. When initially described [by Coltman], pagophagia was defined as the excessive ingestion of ice cubes from ice trays and the ingestion of ice scraped from the wall of the freezer. With the advent of ice cube makers and auto defrosters, the presentation of pagophagia has changed in a subtle manner as described in…our patients. Now we observe a subtler ingestion and/or sucking of ice cubes from large super-sized McDonald’s-like cups and from the use of popular bottled water containers that have been frozen”.
There have been few epidemiological studies examining the prevalence of pagophagia. Such estimates vary widely within particular populations but (according to Dr. Youssef Osman and his colleagues) have been shown to be more common in low socioeconomic and underdeveloped areas. Pagophagia is thought to be relatively harmless in itself or to one’s health, although there are some claims in the literature that pagophagia can be addictive. However, empirical reviews suggest that pagophagia (and pica more generally) is part of the obsessive-compulsive disorder spectrum of diseases. As a consequence, some case studies even suggest that ice chewing compromises their ability to maintain jobs or personal relationships.
Treatment for pagophagia can often be overcome with iron therapy and Vitamin C supplements (to supplement iron deficiency if that is the cause). For instance, Dr. Mark Marinella in a 2008 issue of the Mayo Clinic Proceedings successfully treated a 33-year old woman with pagophagia following complications with gastric bypass surgery:
“The patient received red blood cells, iron sucrose, and levofloxacin. On further questioning, the patient denied taking vitamin, mineral, or iron supplements since surgery and reported prolonged, heavy menstrual cycles. She consumed large amounts of ice daily for several months. The patient’s husband frequently observed her in the middle of the night with her head in the freezer eating the frost off the icemaker. The patient admitted to awakening several times nightly for months with an uncontrollable compulsion to eat the frost on the icemaker. This craving resolved after transfusion and iron administration”
However, if the condition is psychologically or culturally based, iron and vitamin supplements are unlikely to work, and other psychological treatments (such as cognitive-behavioural therapy) are likely to be employed.
Coltman, C.A. (1969). Pagophagia and iron lack. Journal of the American Medical Association, 207, 513-516.
de Los Angeles, L., de Tournemire, R. & Alvin, P. (2005). Pagophagia: pica caused by iron deficiency in an adolescent. Archives of Pediatrics, 12, 215-217.
Edwards, C.H., Johnson, A.A., Knight, E.M., Oyemadej, U.J., Cole, O.J., Westney, O.E., Jones, S. Laryea, H. & Westney, L.S. (1994). Pica in an urban environment. Journal of Nutrition (Supplement), 124, 954-962.
Hata, T., Mandai, T., Ishida, K., Ito, S., Deguchi, H. & Hosoda, M. (2009). A rapid recovery from pagophagia following treatment for iron deficiency anemia and TMJ disorder accompanied by masked depression. Kawasaki Medical Journal, 35, 329-332.
Khan, Y. & Tisman, G. (2010). Pica in iron deficiency: A case series. Journal of Medical Case Reports, 4, 86. Located: http://www.jmedicalcasereports.com/content/4/1/86
Kirchner, J.T (2001). Management of pica: A medical enigma. American Family Physician, 63, 1177-1178.
Marinella, M. (2008). Nocturnal pagophagia complicating gastric bypass. Mayo Clinic Proceedings, 83, 961
Osman, Y.M., Wali, Y.A. & Osman, O.M. (2005). craving for ice and iron-deficiency anemia: a case series. Pediatric Hematology and Oncology, 22, 127-131.
Parry-Jones, B. (1992). Pagophagia, or compulsive ice consumption: A historical perspective. Psychological Medicine, 22, 561-571.