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Success & Failure of Dieting

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Explanations for success or failure of dieting Why do so many females want to lose weight? It's estimated at any 1 time 40% of the female population is trying to lose weight, usually by dieting. If you are obese, losing weight has many health benefits. But many females diet when they have faulty perceptions of their actual body or are simply dissatisfied with their bodies. Ogden ('07) suggests some factors: Media Influence, Family, Ethnicity, Social Class, Peer groups & social learning. Why doesn't dieting work? Some women can lose and maintain weight using diet only. However, most can't and bizarrely they end up eating more. Boundary model; Normal circumstances- Body weight set point controlled through homeostatic mechanisms, can't fluctuate too much (PHYSIOLOGICAL BOUNDARY). But in restrained eaters person also has a COGNITIVE lower than PHYSIOLOGICAL. Tested using Preload/taste test. ...read more.


* Herman&Mack's preload/taste-test was a lab experiment carried out in controlled conditions, so it had high reliability * Cause\effect can't be established as other variables such as mood may have showed the correlation * PPs were all females so results cannot be generalised to male population * No account of individual differences- as sample small not all may like ice cream * Element of deception but needed for validity of experiment, debriefed after. * Not unethical; eat as much or as little pps liked * Given course credit for taking part - so not real 'volunteers' Overall Evaluation * Boundary model- Combines biological & psychological factors to explain feeding behaviour * Much research lab exp - high reliability as controlled conditions but low ecological validity as dieting in real world more complicated .......... * Doesn't explain what cognitive/emotional processes lead to 'what the hell' effect * Ogden- restrained eaters preoccupied with thoughts of food then try to suppress them. ...read more.


PE, group/individual support and self monitoring(diary monitor progress- feel increased control) * Set realistic goals which can actually be maintained and good for health - Powell et al * Psychology/physiology of dieting explains failures of dieting but also helped develop psychological and medical intervention to help weight loss. * Pharmalogical treatments: Treatment of Obesity, significant weight loss but side effects. Never recommended for long term as they don't deal with psychological aspect and could be dangerous side effects. Orlistat- Stops absorption and processing of fat so it's excreted Side effects e.g. oily faeces. Sibutramine- acts on brain serotonin pathways which regulate food intake. SE e.g. High BP. * Surgical Treatment effective as stomach factors e.g. ghrelin in eating avoided and appetite reduced. Only used if obesity is life threatening as dangers of surgery and SE e.g. abscesses and lung infections also mortality rate 2-4% : Gastric band- around stomach reducing size hence amount of food eaten to feel full, Gastric Bypass- tube b/w duondeum and stomach again reduce stomach size so only small meals can be eaten. ...read more.

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