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Health Psychology: Obesity. According to WHO it has reached epic proportions worldwide. 300 million are clinically obese. WHY?. 1 . availability of food 2. proportion of fat in the diet 3 . lack of exercise. Physiological Aspects. Theories
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Health Psychology: Obesity According to WHO it has reached epic proportions worldwide. 300 million are clinically obese
WHY? • 1. availability of food • 2. proportion of fat in the diet • 3. lack of exercise
Physiological Aspects • Theories • Genetic predisposition – having 1 parent increases your chances to 40%; 2 parents = 80% • Evolution – humans programmed to eat when food is available – now it Is inappropriate
Sociocultural Aspects • From 1976-1994 • 60%increase in weight from decrease in physical activity • 40%due to increase in calories • Lack of physical activity and eating behavior • Owning TVs, computers, videos, Automobiles (people don’t walk)
Overeating IS NOT the main reason for growth in obesity • Since 1997- there has been a change in the kinds of food that we eat • Kind of food eaten has changed • More than 45% of their calories come from high fat foods • Calorie intake increased 25% in most countries but Japan
Fat proportion theory of obesity • Well educated and wealthy people tend to be less obese • They eat healthier foods • Exercise more • Obese people don’t eat more, but they eat more fat and high density food • 45% of energy comes from fat • Fat is more likely to be stored, carbohydrates are burned.
Cognitive factors related to obesity • West – Cultural ideal is the thin body, many women diet on a regular basis • Negative body image and low self-esteem are norm in overweight • West – individualistic so if you are thin, you are in control.
Cognitive Restraint Theory • People replace hunger with restraint • Can lead to obesity!! • When diets go below 800cal/day • Chronic dieters often break diets • Easily respond to smell of food, depression, etc. • False Hope sets in.
Global Strategy on Diet, Physical Activity and Health • Australian Plan for Kids • http://www.goforyourlife.vic.gov.au/hav/articles.nsf/practitioners/Healthy_message_campaign?OpenDocument • http://www.youtube.com/watch?v=VgnbRK8pij8
CBT (Cognitive Behavior Therapy) • Challenging eating behaviors learn to recognize and adjust destructive habits • Challenging cognitions – improve body image and self-confidence • Long term maintenance – maintain motivation and strengthen coping skills
Dieting • Most lose weight, but the majority _regain_theweight within a few months • Yo-yo dieting - harmful
Drug Treatments • Appetite suppressants – work, but side effects • Surgical treatments • Work, but expensive and invasive!!! • Gastric bypass more successful than gastric banding.