Success and Failure of Dieting

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  • Created by: Amy
  • Created on: 15-01-13 19:42
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  • Success and Failure of Dieting
    • Boundary Model (Herman and Polivy)
      • Why dieting leads to overeating
      • Dieters set themselves a boundary and try to eat within this limit
        • However on occasion they may go over their boundary and will then binge until they are full
      • Wardle and Beales
        • 27 obese women placed in 3 groups
          • Diet Group/Exercise group/Control group
        • Lab experiments to test their food intake
        • Participants in the diet group ate more than the other 2 groups
        • Evaluation
          • Supports Boundary Model
          • High internal validity, well controlled
          • Didn't take extraneous variables into account
          • Low sample size - low reprentativeness
          • Gender bias - all women - low population validity
          • Artificial setting; hawthorne effect
    • Restraint Theory (Ogden)
      • If one is restraining their eating, one should eat less. But it has been found that restrained eating can lead to both under and over eating
      • Herman and Mack
        • Compared restrained eaters (dieters) with non dieters using preload/taste test method. 45 female students
        • 3 conditions
          • No preload (no milkshake)
          • High ccalorie  preload (2 milkshakes)
          • Low calorie preload (low calorie milkshake)
        • Told they were doing a taste-preference test
          • The actual DV was how much of the taste-test food they ate (they weren't aware)
          • Overall the non dieters compensated for high calorie preload by eating less on the taste test
            • Dieters ate more on the taste-test if they had a high-calorie preoload
              • Could be due to disinhibition - eating more as a result of being loosened. A kind of 'what thell' attitude
        • because they didn't know the true aim, no social desirability bias/hawthorne effect - wond mind eating alot - less chance of them thinking they're 'fat'
        • High internal validity
        • No fully informed consent - not ethical
        • Gender bias - all females
        • Small sample size - low pop validity
    • Successful dieting
      • Ogden and Hills
        • Conducted interviews with successful dieters and found 4 long term factors that they had in common
          • Hold a model of obesity that focuses on behaviour as central to their weight problem
          • Avoid state of denial whereby they want to eat but do not
          • Create a situation where food is no longer regarded as rewarding
          • Establish a new identity has a thinner, healthier person
      • Powell, Calvin and Calvin
        • Suggested that dieting can be successful when combined with other lifestyle changes
          • physical exercise
          • group and individual support
          • monitor own progress
      • Odgen - the theory of ironic processes of mental control
        • the more people try to forget about the forbidden food the more they found themselves thinking about it
        • Supported by Wegner et al who asked P's not to think of a white bear but ring the bell if they did. Those P's rang the bell more often than those who were specifically told to think about the white bear
      • Redden
        • The secret of successful dieting lies in the attention we pay to what we are thinking
          • people like experiences less are we repeat them, restrictive nature of a diet would et boring
        • 135 participants given 22 jelly beans
          • Group one: general info given, gave them jelly beans invidually with boringness: 'bean number 5'
            • Got bored with eatin beans
          • Group 2: specific info like 'cherry flavoured bean 7'
            • Enjoyed task more
          • Culture Bias
          • Gender bias


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