PSYC 3403 Lecture 10: Lecture 10
23 Feb 2016
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Document Summary
Factors that mediate food intake: homeostasis (energy demands, emotional stat (stress, boredom, hedonism (pleasure) Simple biological model: humoral signals hypothalamus food intake. Hunger-stimulating gi peptides: ghrelin (stomach, pancreas) Activates a portion of da reward pathway. Mechanism of action for leptin at hypothalamus: antagonizing the effects of neuropeptide y (stimulant, antagonizing the effects of anandamide, promote synthesis of a-msh (appetite suppressant) Mechanism of action for insulin: hormones: Hypothalamus: primary regulatory center for food intake and body weight. The hypothalamus has two distinct regions: ventromedial hypothalamus, lateral hypothalamus. Each region regulates the opposing action: hunger vs. satiety. Why do we eat too much? (cid:1) (cid:1) (cid:1) (cid:1) Personal food consumption has increased: disrupted neurobiology, poor impulse control, environmental factors, serving size, food access, social context, stress. Little or no physical activity: low activity. Daily routine and leisure time has some limited physical activity: active: Atleast 2. 5 hours of moderate to vigorous activity per week.
