PSYC 1000 Lecture Notes - The Reward, Blood Sugar, Leptin

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Hungry, thirsty tired, lonely, poor, dirty, cold, hot, in danger - all things that are unpleasant states to be in, and you have certain drives that motivate you to change them. Homeostasis a state of psychological equilibrium that the body strives to maintain. Mechanical stomach and intestinal digestion chemical: nutrients lipid. Glucose sensors when blood glucose levels decrease. *level of circulating leptin is proportional to the totally amount of fat in the body. Mutations that affect leptin production of reception. Pyy: short-term suppression of hunger between meals. Leptin: long-term suppression in response to abundance of stored energy. Orexin has many influences on how much we eat. For many people/ animals, food is not always available when energy low. Evolution: motivation to eat when food is available, regardless of internal energy state. Problem: when food is in constant availability, overeating results. Mere sight/smell of food drop in blood glucose hunger/eating.

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