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Eating Disorders

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Eating Disorders An abnormal obsession with food and weight * Anorexia nervosa A disorder of under consumption of food Weighs 85% or less Affects puberty ... – PowerPoint PPT presentation

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Title: Eating Disorders


1
Eating Disorders
  • An abnormal obsession with food and weight

2
Anorexia nervosa
  • A disorder of under consumption of food
  • Weighs 85 or less
  • Affects puberty, menstruation, sex drive
  • Associated with depression, irritability,
    withdrawal and peculiar behaviors

3
Who becomes anorexic?
  • 2.5 of North American students
  • 90-95 girls and women
  • Does culture play a role?

4
What causes Anorexia?
  • No single known cause
  • Culture
  • Families
  • Life changes or stressful events
  • Personality traits
  • Biology

5
More on biology and psychology
  • Serotonin (high and low)
  • Autoimmune response to melanocortin peptides
  • Perceive themselves as larger
  • Lack overconfidence bias
  • Poor cognitive flexibility, attentional biases

6
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7
Anorexics are ambivalent about food
  • Cephalic-phase response
  • Preoccupied with food
  • Disgusted by sweet and fatty tastes
  • Feel ill after a meal

8
Anorexia and Positive Incentives
  • Decline in the positive-incentive value of eating
    food vs. interacting with food
  • Positive-incentive values of various tastes
  • Starvation normally triggers a radical increase
    in the positive-incentive value of food

9
Meals
  • Meals forced on anorexic patients may cause taste
    aversions that reduce the motivation to eat
  • Should be fed or infused with small amounts of
    food intermittently throughout the day

10
Bulimia Nervosa
  • A psychological condition in which the subject
    engages in recurrent binge eating followed by an
    intentional purging (i.e. vomiting, laxatives,
    diuretics, excessive exercise, etc.)

11
Causes and Factors
  • Psychological issues and profound feelings of
    lack of control
  • More prevalent in Caucasian groups
  • Women 90
  • Activities that emphasize body type
  • Anxiety and other mood disorders
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