All Eating Disorders

Demystifying the Genetic and Environmental Influences on Disordered Eating

Tetyana 8 Comments

Genetics play an important role in the development of eating disorders and disordered eating behaviours. To date, many (over 30!) twin studies have been done and all but two found significant genetic effects on the development of eating disorders and disordered eating. However, no methodology is without limitations and tentative conclusions become more convincing when the findings are confirmed using different experimental approaches.

Twin studies, while they offer many advantages, are not that good when it comes to detecting shared environmental effects on a particular trait (literally, evens that happen to both twins and affect them in the same way). Fortunately, twin studies are just one of several different ways that researchers can use to study heritability. (A quick reminder: Heritability measures the amount of the variability in an observable trait/behaviour that can be attributed to genetic variation. This is NOT the same as stating … Continue reading →

The Impact of an Eating Disorder Prevention Program: The Girls’ Perspective

Andrea 8 Comments

Over the years, I have read a number of articles describing eating disorder prevention programs. Unfortunately, many reveal limited efficacy, and some even highlight detrimental effects. Primary among concerns of those evaluating prevention programs is that even when effective, we often have limited data about the long-term effects of prevention programs. This lack of follow-up limits the ability to draw conclusions about these initiatives and is cause for pause for those interested in implementing strategies to prevent eating disorders.

Further, there is some debate about whether eating disorders are even really “preventable.” Given our understanding of the complex etiology of these disorders, “prevention” can be a loaded word. The nature of the proposed intervention will undoubtedly be heavily swayed toward whichever factor(s) the program’s designer feels is most important in “causing” or contributing to disordered eating (i.e., Is the program tailored toward media awareness? Nutrition? Body image?)

I approached a … Continue reading →

Emotion Fluctuations in Anorexia and Bulimia Nervosa: A Rollercoaster or Not So Much?

Tetyana 2 Comments

Restricting, bingeing, and purging are powerful ways to regulate emotional states. However, these behaviours probably play different roles in emotional regulation. Whereas restriction is hypothesized to pre-empt the onset of highly emotional states, bingeing and purging is thought to act as a coping mechanism to deal with overwhelming emotional states once they’ve already been activated. 

In BN there is abundant evidence that the binge–purge cycle functions as a means of emotion regulation. Binging [and I would arguing purging too! ] facilitates a temporary suppression of painful self-awareness and helps the self to dissociate from painful emotions or to block negative affect as demonstrated in both laboratory studies and diary studies in daily life.

In AN, restrictive eating patterns have been linked with a narrowing of emotional functioning, flattening of affect and lack of outward display of emotion. As such, Waller, Kennerley, and Ohanian (2007) argue that both binge– vomit-cycle and

… Continue reading →

Body Image: Is It a Useful Concept? (Maybe Not So Much)

Andrea 6 Comments

I recently attended the International Society of Critical Health Psychology’s 8th Biennial Conference in Bradford, England. At the conference, I had the pleasure of attending many talks that challenged the way we approach health psychology. Luckily for me, there were several sessions that touched on issues of disordered eating and body image.

One such talk, a panel presentation with Hannah Frith, Sarah Riley, Martine Robson and Peter Branney, challenged attendees to re-think the way we approach body image. When I returned home, I immediately downloaded an article by Kate Gleeson and Hannah Frith (2006) that discusses this same idea and essentially begs the question: Is the concept of “body image,” as it is currently articulated, actually useful?

This might come off as a controversial question; after all, body image is central to many studies (and treatment programs) related to eating disorders. We’re told repeatedly … Continue reading →

CCK and the "Hunger Trap" in Anorexia Nervosa (Why Gaining Weight is Hard)

Tetyana 4 Comments

Cholecystokinin (CCK) is a digestive hormone that stimulates fat and protein digestion, and promotes the feeling of satiety. CCK is released after food consumption to promote digestion (by releasing digestive enzymes from the pancreas and stimulating bile secretion). In rats and monkeys, injection of CCK induces satiety, though it seems (from what I’ve skimmed), the extent to which CCK regulates food intake in humans is not well-established. Previous research on the role of CCK in anorexia nervosa (AN) has found conflicting results, in part because of methodological issues related to measuring levels of CCK. In a recent study, Cuntz and colleagues (2013, freely available online), having developed a better assay for measuring CCK, wanted to clarify its role in AN patients.

The authors had the following goals and hypotheses (I omitted one):

  • Objective 1: Compare CCK levels between AN patients and healthy controls before and after a meal
  • Objective
… Continue reading →

Perspectives of Siblings of Adolescents with Eating Disorders

Andrea 14 Comments

The experiences of siblings of individuals with eating disorders has received relatively little space in the academic literature to date. Several studies have revealed the disruptions in family life that can occur when a child has an eating disorder (for example, see Hillege, Beale & McMaster, 2005 and Perkins et al., 2004). On the other hand, some studies have shown that siblings of patients with chronic illnesses have both positive (personal growth, responsibility, increased empathy) as well as negative (worry, fear, resentment) experiences.

However, few studies have explored experiences of male siblings, older siblings, or siblings of adolescents with eating disorder not otherwise specified (EDNOS). Consequently, to help fill this gap, Areemit, Katzman, Pinhas & Kaufman (2010) conducted a mixed-methods study looking at experiences and quality of life among siblings of adolescents with eating disorders.

Twenty siblings were recruited from The Hospital for Sick Children in Toronto. … Continue reading →

Hide or Seek? Social Support and Eating Disorders

Andrea 5 Comments

Social support has been noted as key in helping individuals with any number of health issues to cope with illness and even thrive in adverse situations (Sarason, Sarason & Pierce, 1990). Individuals with eating disorders may be encouraged, as an adjunct to treatment or even in the absence of formal treatment, to seek out social support to help with the day-to-day management of their disorder (Holt & Espelage, 2002). However, not everyone with an eating disorder seeks out social support; in fact, some may actively avoid seeking support during trying times. To find out more, Akey, Rintamaki & Kane (2012) examined social support seeking among men and women with eating disorders.

The authors interviewed 34 men and women, aged 18-53 (mean age 25) diagnosed with eating disorders and used grounded theory methodology (Glaser & Strauss, 1967) to analyze their data. As explained … Continue reading →

How Much Can We Learn About Eating Disorders From Animal Research?

Liz 4 Comments

I have been studying the neurobehavioral aspects of food and drug reinforcement for the past 5 years (read more about it on my profile page). This involves using rats to mimic basic human behaviors surrounding food and drug intake. I then manipulate various neurotransmitter systems by using drugs and observe the effects this manipulation has on the behaviors I am interested in.

What’s important to this type of research is that we constantly challenge and evaluate the validity of using these animal models to study complex human diseases and disorders. Validity can be divided into several categories, but I’m going to focus on two in particular and relate them to an animal model of binge food intake.  These two types of validity are predictive validity and construct validity:

  1. Predictive validity, when comparing animal research to human research, refers to the ability for some measure of animal behavior
… Continue reading →

Life After Recovery for Men with Eating Disorders

Andrea

While there is growing recognition that (surprise, surprise!) men are not immune to eating disorders, men are still underrepresented in the literature about eating disorders. We know comparatively little about what it is like to be a man with an eating disorder, and less still about recovery and life after recovery for these individuals. Recently, Björk, Wallin, & Pettersen (2012) conducted a qualitative study that asked men who had been diagnosed with an eating disorder and completed treatment to describe how recovery factors into their present lives. The researchers interviewed 15 men aged 19-52 (mean age 23) in Norway and Sweden, 10 of whom had been diagnosed with AN, 4 with BN, and 1 with EDNOS. The authors did not specify duration of illness.

PHENOMENOGRAPHY

The authors used a phenomenographical approach to study recovery among men. Though I am familiar with qualitative methods, this approach was new to … Continue reading →

Interpreting Anti-Obesity Campaigns with a History of Disordered Eating

Andrea 28 Comments

Advertisements bemoaning the evils of obesity, begging us to eat healthier and to exercise, surround us every day. Big corporations and governments alike have jumped on the anti-obesity bandwagon, crafting public service announcements aimed at correcting what is being framed as an epidemic. For many, these messages are likely generic reminders to strive for health, if they are noticed at all. But what about individuals with eating disorders? A recent (2012) study by Catling & Malson (full text available here) looked into how a group of women with a history of disordered eating interpreted anti-obesity messages.

I was particularly drawn to this article, having personally felt rage at some of the overly simplified messages that circulate around obesity and “health.” Particularly when I was early in recovery, I often felt as though I was swimming against the current in my attempts to do just the opposite to what these … Continue reading →