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Hunger Slides Hunger Slides Presentation Transcript

  • Hunger m35
  • Physiology of Hunger
  • In the 1950s, Ancel Keys used volunteers from the US Army to study hunger. Procedure Results Lethargy Weight dropped & stabilized at 75% of normal Concluded that hunger is a response to a homeostatic system designed to maintain normal
  • Washburn and Cannon found that appetite lessens if the stomach is shrunk (because there is less ghrelin)
  • And older theory was based on the body’s set point, or natural weight. If the body was heavier, then it increased the basal metabolic rate; if lighter, it decreased the rate.
  • The body depends primarily on glucose for its energy. Insulin (from the pancreas) decreases the amount of glucose in the system by converting it into fat. Leptin is produced by fat cells and decreases hunger.
  • The lateral hypothalamus increases hunger. The ventromedial hypothalamus decreases hunger.
  • Psychology of Hunger
  • Taste preference is Biological There is a genetic predisposition to like sweet and fatty tastes, but dislike bitter. There is a genetic distrust of novel foods. Cultural You like what you know and are familiar with. (mere exposure effect)
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • A week’s food
  • 300-400 Calorie meals
  • 300-400 Calorie meals
  • 300-400 Calorie meals
  • 300-400 Calorie meals
  • 300-400 Calorie meals
  • 300-400 Calorie meals
  • Three major eating disorders: Anorexia nervosa Bulimia nervosa Obesity
  • Anorexia nervosa is a condition wherein a person is purposefully 15% below their normal weight (BMI < 16) Between ½-1% of Americans suffer from anorexia nervosa. Anorexia has the highest mortality rate (5-10%) of any psychological disorder.
  • Bulimia nervosa is a condition involving cycles of binging and purging.
  • Obesity is the most prevalent eating disorder in the United States. • BMI of 30 or higher • Check your BMI: http://tinyurl.com/ll2u