Psychology Eating Disorders Biological and Evolutionary Hypothesis

Biological explanations of eating disorders and evolutionary hypothesis

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What role does the hypothalamus play in eating?
Regulates homeostasis and acts like a thermostat to hunger in starting/stopping eating behaviour
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What is the ventromedial hypothalamus?
Satiety centre
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What is the lateral hypothalamus?
Feeding centre
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What does the hormone leptin do?
Tells us we are full
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This model suggests we have a homeostatic perception of hunger and satiety
Dual centre model of feeding
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What are the signals for starting a meal?
Cultural schedule, release of saliva, taste and smell of food, ghrelin
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What is ghrelin?
A hormone located in the stomach which makes you feel hungry
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Cummings did a study to show...
There was a relationship between production of ghrelin and hunger
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As food leaves the stomach a hormone called CCK is released. What does this do?
Induces satiety and can also act as a hunger suppressant (opposite of ghrelin)
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Rats and humans eat
More tastier food than less tasty food and we eat more when we are in company
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As more fat is produced...
More leptin is produced and the hypothalamus is stimulated to reduce food intake
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The biological explanation for eating is
Reductionist and animal studies may not reliably reflect human eating centres
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What are the five senses?
Sweet, sour, salt, bitter, umami
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What is food neophobia?
Fear of the new - not wanting to try new food
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What is taste aversion learning?
A food making us sick and avoiding it in future
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Who tested taste aversion learning with wolves?
Garcia
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At what stage does morning sickness occur?
Early stages of pregnancy
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The Embryo Protection Hypothesis states that....
The reason they are sick is to protect the baby - sick gets rid of any toxins in the body
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What were the advantages of eating meat and humans being omnivores?
More efficient way of eating - quick and makes you more full.
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What was it likely that those who were good at acquiring skills to kill and get food would have?
Increased survival and reproductive success with power and esteem in the pack
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What is the evolutionary hypothesis' disadvantages?
We can't test history as it's already happened and ignores social, cultural and behavioural factors
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What do we use to test the evolutionary hypothesis instead?
Knowledge, fossil evidence, teeth, digestive system of skeletons
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Other cards in this set

Card 2

Front

What is the ventromedial hypothalamus?

Back

Satiety centre

Card 3

Front

What is the lateral hypothalamus?

Back

Preview of the front of card 3

Card 4

Front

What does the hormone leptin do?

Back

Preview of the front of card 4

Card 5

Front

This model suggests we have a homeostatic perception of hunger and satiety

Back

Preview of the front of card 5
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