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Physiology of Hunger
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In the 1950s, Ancel Keys used volunteers from theUS Army to study hunger.
Procedure
Results
Lethargy
Weight dropped & stabilized at 75% of normal
Concluded that hunger is a response to ahomeostatic system designed to maintainnormal body weight and an adequate nutrientsupply.
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Washburn and Cannon found that appetitelessens if the stomach is shrunk (because
there is less ghrelin)
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And older theory was based on the bodys set
point, or natural weight.
If the body was heavier, then it increased thebasal metabolic rate; if lighter, it decreased the
rate.
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The body depends primarily on glucose for its
energy.
Insulin (from the pancreas) decreases the
amount of glucose in the system by converting itinto fat.
Leptin is produced by fat cells and decreaseshunger.
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The lateralhypothalamus
increases
hunger.
The ventromedial
hypothalamusdecreaseshunger.
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Psychology of Hunger
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Taste preference is
Biological
There is a genetic predisposition to like sweetand 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)
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A weeks food
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A weeks food
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A weeks food
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A weeks food
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A weeks food
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A weeks food
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A weeks food
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A weeks food
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A weeks food
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300-400 Calorie meals
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300-400 Calorie meals
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300-400 Calorie meals
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300-400 Calorie meals
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300-400 Calorie meals
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300-400 Calorie meals
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Three major eating disorders:
Anorexia nervosa
Bulimia nervosa
Obesity
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Anorexia nervosa is a conditionwherein a person is purposefully 15%
below their normal weight (BMI < 16)
Between -1% of Americans suffer
from anorexia nervosa.
Anorexia has the highest mortality
rate (5-10%) of any psychologicaldisorder.
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Bulimia nervosa is a conditioninvolving cycles of binging andpurging.
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Obesity is the mostprevalent eating
disorder in theUnited States.
BMI of 30 or higher
Check your BMI:http://tinyurl.com/ll2u
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