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Chapter 12 - Thurs Jan 10.docx

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Don Morgenson

Hungary Drives – biological drive however not solely affected biologically (environment has an effect) - Reduced capacity of the stomach reduces hunger - Some who have their stomach get removed still feel hungry - More complex than a rumbly stomach 1. Stomach Signals 2. Chemical Signals a. Glucose – crude starches in the blood, and there are receptors in the brain that are sensitive to glucose called glucose stats b. Leptin – protein that regulates the amount you eat – send signals for us to stop eating when full *Over eating or under eating could be a biological dysfunction 3. Hypothalamus a. Lateral Hypothalamus (LH) – don’t eat enough, could cause death b. Ventral Medial Hypothalamus (VMH) - eat too much Prader-Willi System - Genetic disorder - People can’t control eating - Caused with problems in the Hypothalamus Insulin - Released from …. - Extracts glucose from blood cells to give us energy Environmental Factors 1. Food Preferences (culture, social) – learned habits 2. Food cues/ food related cues 3. The effects of stress and arousal a. With some psychological disorders, eating disorders can develop Set Point Theory - Says that we have an ideal weight that our body naturally stays at - If we over eat the metabolism increases to release more energy - If we under eat our metabolism decreases - Homeostatic mechanism – that helps us control our weight - The long term success rate of any diet – the results are dismal and the body regains the lost weight normally Stanley Schachter - Normal eaters respond to internal cues – chemical agents, hormones, etc. - Those who follow external cues eat more than they need e.g. smells, lots of food available, etc. - The over eater shows no correlation with internal cues – ignore internal cues – and continue to eat after they are full, because food is available - Over eaters follow external cues, e.g the time on the wall as the signal to eat - Over eaters eat the same amount when calm and scared – but normally people eat less when they are scared or stressed - Over eaters eat less if there was work involved e.g. if you had to take a shell off a nut, over eaters would eat less - Normal eaters respond to homeostatic responses **correlation not necessarily the final answer Genetic Predisposition - Possible to override with environmental experience - The genes may predispose us however the environment must support that for it to occur
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