m35 hunger slides

8/7/2019 m35 Hunger slides

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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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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
http://tinyurl.com/ll2uhttp://tinyurl.com/ll2uhttp://tinyurl.com/ll2u

m35 hunger slides

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