PSYB32H3 Chapter Notes - Chapter 9: Bulimia Nervosa, Binge Eating Disorder, Etiology

31 views8 pages
14 Dec 2010

For unlimited access to Textbook Notes, a Class+ subscription is required.

Chapter 9: Eating Disorders
Clinical Description
Anorexia and Bulimia share that there is an intense fear of being overweight
Anorexia Nervosa
Anorexia: Loss of appetite
Nervosa: caused by emotional reasons
But most patients with anorexia nervosa actually don’t lose their appetite in food
Most patients starve themselves but they become preoccupied with food; they may read
cookbooks constantly and prepare gourmet meals for their families
Features for the diagnoses
o* The person must refuse to maintain a normal body weight
oThe persons weight is less than 85% of what is considered normal for that persons
age and height
oThere is dieting or purging (self-induced vomiting, heavy use of laxative or
diuretics), excessive exercise
o* Intense fear or gaining weight and the fear is not reduced by weight loss
o* Have a distorted sense of their body shape even when they are emacinated
oThey believe in particular that their abdomen, buttocks and thighs are too fat
oWeigh themselves frequently, measure the size of different parts of the body, and
gaze critically at their reflections
o* Amenorrhea: loss of the menstrual period
oBut this loss of period occurs in a minority of women before any significant
weight loss
Eating disorder inventory: self report of eating disorders; questionnaire
There is another test where they show a picture of 3 bodies and they are asked to pick the
one that looks like themselves; the patient with anorexia nervosa overestimate their own
body size and chose the thinner one as their ideal
2 types of anorexia
oRestricting type: weight loss is achieved by severely limiting food intake
oBinge eating-purging type: person regularly engages in being eating and purging
More psychopathological
Patient exhibit more personality disorders, impulsive behaviour, stealing,
alcohol and drug abuse, social withdrawal and suicide
Tend to weigh more in childhood, come from heavier families with greater
familial obesity and tend to use more extreme weight-control methods
Typically begins in early to middle teenage years, often after an episode of dieting and
exposure to life stress
10x more frequent in women than men
Prevalence of less than 1%
Chapter 9 : Eat i ng Disorders
Page 9
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 8 pages and 3 million more documents.

Already have an account? Log in
Patients are frequently diagnosed with depression, obsessive compulsive disorder,
phobias, panic disorder, alcoholism, oppositional defiant disorder, and various
personality disorders
Women are more likely to have sexual disturbances
Physical changes in Anorexia Nervosa
Self starvation and use of laxatives
Blood pressure falls, heart rate slows, kidney and gastrointestinal problems develop, bone
mass declines, the skin dries out, nails become brittle, hormone levels change and mild
anemia may occur
They may lose their hair and develop laguna (fine, soft hair on their bodies)
Levels of potassium and sodium are altered
oLower levels can lead to tiredness, weakness, cardiac arrhythmias and even
sudden death
Brain size declines (white matter volumes can restore, but gray matter are irreversible)
70% will recover
Take 6-7 years and relapses are common before a stable patter of eating and maintenance
of weight is achieved
Death rates are 10x higher when compared to the normal population
Death result mostly from physical complications of the illness
Bulimia Nervosa
Bulimia nervosa: episodes of rapid consumption of a large amount of food, followed by
compensatory behaviours, such as vomiting, fasting or excessive exercise, to prevent
weight gain
Binge: eating excessively within less than 2 hours
Mostly done in secret
High levels of interpersonal sensitivity
Often feel they can’t control the amount they eat
So they eat in high volumes and feel like they have lost their awareness then they purge it
out through gagging and vomiting
Bulimia nervosa requires that the episode of binging and purging occur at least 2x a week
for 3 months
They have a morbid fear of fat
2 subtypes
oPurging type
oNon purging type – fasting or excessive exercise
Typically begins in late adolescence or early adulthood
90% women with a prevalence of 1-2%
70% recover 10% remain fully symptomatic
Associated with depression, personality disorder, anxiety disorder, substance abuse, and
conduct disorder
Higher suicide rates
Chapter 9 : Eat i ng Disorders
Page 9
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 8 pages and 3 million more documents.

Already have an account? Log in
Associated with stealing (lack of self control)
Side effects: potassium depletion, diarrhoea, irregular heartbeat, tearing of tissue in
stomach and throat and loss of dental enamel, swollen salivary gland
Lower mortality rate
Binge Eating Disorder
Diagnosis that needs further study
Includes recurrent binges (2x / peek for at least 6 months), lack of control during the
binging episode, and distress about binging as well as other characteristics, such as rapid
eating and eating alone
Distinguished from anorexia but the absence of weight loss and from bulimia nervosa and
absence of compensatory behaviours (purging, fasting, or excessive exercise)
More prevalent than the other two
Occurs more in women, associated with obesity and history of dieting
Linked to impaired work and social functioning, depression, low self-esteem, substance
abuse, and dissatisfaction with body shape
Risk factors: childhood obesity, critical comments regarding being overweight, low self
concept, depression and childhood physical or sexual abuse
Etiology of Eating Disorder
Biological Factors
Both anorexia and bulimia run in families
First degree relatives are 4x more likely
Eating Disorders and the Brain
Hypothalamus – regulates hunger and eating
Lesions to lateral hypothalamus show lose in weight and appetite
Abnormality of cortisol hormone causing self-starvation
Endogenous opioids: substance produced by the body to reduce pain sensations, enhance
mood and suppress appetite, at least among those with low body weight
oReleased during starvation
oThe disorder is seen to have increased levels of opioids resulting in a positively
reinforcing euphoric state
oBut bulimia is scene to have low levels of it, whereas excessive exercise within
Anorexia seems to increase the level of endogenous opioids
Serotonin deficit may be related to bulimia nervosa as well
Sociocultural Variables
Models and our culture to be thin
Scarlett O’Hara effect: phenomenon of eating lightly to project femininity
But there actually has been an increase in overweight people also
Diet industry is valued at more than $30 billion per year
Chapter 9 : Eat i ng Disorders
Page 9
Unlock document

This preview shows pages 1-3 of the document.
Unlock all 8 pages and 3 million more documents.

Already have an account? Log in

Get access

$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class