failure of dieting

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  • Created by: ishika
  • Created on: 07-02-13 17:30
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  • Restraint theory
    • Herman and Mack
      • 3 conditions
        • No preload (no milkshake)
        • Low calorie preload (low calorie milkshake)
        • hiigh calorie preload (2 milkshakes)
      • compared restraint dieters with non-dieters using the preload/taste test method, used 45 female students
      • given questionnaires on attitudes to food and dieting to identify restrained eaters and unrestrained eaters
      • all groups were then given a tub of ice cream and were asked to rate its taste qualities, they could eat as much as they liked in 10 min
      • unrestrained eaters eat less after preloads as they are close to their biological set points
        • restrained eaters (dieters)- with no preload they eat until they reach their cognitive boundary, they do not eat very much
          • in high calorie preload conditions, the preloads push themselves beyond this cognitive boundary, they have a 'what the hell' and eat until their biological set point i.e. more than in the preload condition
      • because they didn't know the true aim of the study- no social desirability- less chance of thinking they're 'fat'
      • division into restrained and unrestrained eaters was done at the end of the study to prevent biass in the finding, so within the preload groups the numbers were not equal, reduces reliability
      • some participants may have liked ice cream more than others
      • lab study- good internal calidity
      • low ecological validity- dieting in the real world may involve more complicated issue
    • Boundary model  (Herman and Polivy)
      • Why dieting leads to over eating
      • Wardle and Beales
        • 27 obese women  placed in 3 groups
          • diet group/exercise group and control group
        • lab experiment to test their food intake
        • Participants in the diet group ate more than the other 2 groups
        • supports boundary model
        • high internal  validity
        • Gender bias- all women- low population validity
        • Didn't take extraneous variables into account
        • low sample size therefore not representative
      • hunger keeps intake above minimum, and satiety keeps intake below some maximum level
      • dieters tend to have a larger range between hunger and satiety as it takes them longer to get hungry and more food to satisfy them
      • on some occassions they may go over their boundary and will binge until they are full

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