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Eating Disorders

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					     Eating Disorders

An abnormal obsession with food
         and weight



                                  1
              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




                                                2
       Who becomes anorexic?
• 2.5% of North American
  students
• 90-95% girls and women
• Does culture play a role?




                               3
          What causes Anorexia?
•   No single known cause
•   Culture
•   Families
•   Life changes or stressful events
•   Personality traits
•   Biology



                                       4
  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



                                                   5
6
            Anorexics are ambivalent
                  about food
•   Cephalic-phase response
•   Preoccupied with food
•   Disgusted by sweet and fatty tastes
•   Feel ill after a meal




                                          7
    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




                                                    8
                    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




                                                  9
             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.)




                                                  10
           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



                                                  11

				
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posted:7/22/2012
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