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Dieting Obesity and Eating Disorders

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Dieting Obesity and Eating Disorders Powered By Docstoc
					Dieting and Obesity
Setpoint Theory of Weight
   Setpoint: what an individual weighs
    when s/he eats a “normal” amount of
    food in a “normal” way

   May not be the same as one’s
    psychologically ideal weight
Basal Metabolic Rate

 Definition


 Variations


 Factors   that increase or decrease
 BMR
Keys Study on Starvation
(1950)
 Purpose


 Subjects


 Method
Effects of Starvation

 Physical   responses

 Appetitive   responses

 Psychological   responses
Sims et al. Study on Weight
Gain (1968)
 Purpose


 Subjects


 Method
Effects of Attempting to Gain
Weight
 Increases in body temperature and
 perspiration

 Post-experiment   weight
 stabilization
Heritability Estimates from
Twin Studies
Breast Cancer            45%
Coronary Heart Disease   49%
Epilepsy                 50%
Alcoholism               57%
Schizophrenia            68%
Height                   80%
Weight                   81%
Overweight and Obese

 Body   Mass Index guidelines

 Health profession’s insistence on
 treating obesity
Addictions Model of Obesity
   Food as a drug

   Effects on mesocorticolimbic system –
    the dopamine pathway

   Sensitivity to reward

   Poor decision making
Dieting Methods
 Fasting
 Liquid protein
 Very low calorie diets
 Low calorie diets
 Low fat diets
 Commercial weight loss programs
Quote:
  “If a cure from obesity is defined as a
  reduction to ideal weight and
  maintenance of that weight for 5 years,
  a person is more likely to recover from
  most forms of cancer than from obesity”

Kelly Brownell
Medical Complications of
Obesity
 Prospective   studies

 Cross-sectional   studies
Mortality

 Selective   citations

 Protective
           factors of overweight
 mostly ignored
Summary
 Negative  impact of obesity on
  longevity and health has been
  overstated
 Dieting is an ineffective treatment
  for obesity
 Dieting may do more harm than
  help
Restrained vs. Unrestrained
Eaters
 Weight
 Cognitive Performance
 Mood
 Self-Esteem
 Eating Behaviour

				
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