psych notes part 7 - hunger and eating

psych notes part 7 - hunger and eating - Hunger One of the...

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Hunger One of the major drives is hunger . Hunger, of course, leads to eating . And eating (i.e., feeding), as you will recall, is one of the “Four Fs” controlled by the hypothalamus. Now, I realize that this might not be everyone’s first choice, as far as which of the “Four Fs” to cover in detail. But it’s the one I’ve chosen to cover in detail. This discrepancy in “first choice of F” might be because of our difference in ages. By the time you get to be my age, eating just might be your favorite “F.” - It is certainly the “F” I engage in most often. As you may already know, when people get older, they tend to slow down a lot. And sex is certainly one of the areas in which you slow down. - Rodney Dangerfield: “I mean, I get tired now just holding up the magazine.” Hunger, on the other hand, is one drive that stays with people throughout their lifetime. Although you might eat less each day than you did when you were younger, eating is still, at least, something you’re going to do every day. Another reason why we’ll cover this particular “F” (i.e., feeding) is that we’ll get to look at eating disorders like anorexia nervosa and bulimia , and we’ll also take a look at obesity .
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So now we’ll start talking about hunger and eating . We’ll be considering three specific questions about eating: - when - what - how much When do we eat? (what controls the hunger drive) A. physiological control of hunger: peripheral control B. physiological control of hunger: central (brain) control C. psychosocial control What do we eat? A. food choices B. food aversions and disgust C. benign masochism How much do we eat? A. anorexia / bulimia nervosa B. obesity
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First, let’s consider when we eat. Q: When do we eat? As usual, we will first consider the “common sense” answer to this question. It’s simple: - We start eating when we’re hungry; - We stop eating when we're full. As you’ll see in a moment, there are some very important evolutionary reasons why this “common sense” answer cannot be right: A: We don't just eat when we’re hungry and stop when we're full. Evolutionary considerations First, let’s consider some evolutionary considerations. One very important problem for our ancestors was the inconsistency and unpredictability of the food supply. Our ancestors’ food supply was: - inconsistent; - unpredictable. So, evolutionary pressures selected for those who tended to: - store fat, rather than burning excess calories; - eat more than they need to satisfy hunger at one sitting; - prefer foods that are high-calorie (correlated with sugar), high-nutrient, high-fat. So we need to look beyond the simple-minded “common sense” answer to the question of when we eat. We’ll start with some pieces
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psych notes part 7 - hunger and eating - Hunger One of the...

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