Evolutionary explanations of food preference

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  • Created by: Gemma
  • Created on: 20-04-14 17:03
What does EEA stand for?
Environment of Evolutionary adaptation
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What does EAA mean?
refers to the environment in which a species 1st evolved
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What was the early human diet like + why?
Lived in a hunter-gatherer society. Food was scarce + so when prey was caught they ate the most fatty areas and the areas which were rich in calories. This would enable them to get all the necessary vitamins&nutrients needed to stay alive +find prey
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What 3 main areas are looked at?
The preference for meat, calories, taste aversion ( bait shyness+ medicine effect)
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What evidence is their for the preference of meat?
Fossil evidence - ate organs of other animals
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Milton
Early humans could not have been vegetarian,despite claims-couldnt have harnessed enough nutrition from vegetation to have evolved into intelligent creatures they are today. Need AA in order to grow
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Gibson + Wardle
Best predictor of calories preference; give 4-5 yr olds the options of fruit + veg. They chose banana + potato which are highly rich in calories
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Steven + Price
Highly rich in calorie diet could be due to the rise in obesity. People have an inability to escape the evolutionary pressure ------ not true AN numbers increasing aswell
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Stanford
Chimpanzees who have been starved, when first kill they go for the fattiest region of the animal e.g. brain
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What is bait shyness/taste aversion?
Whereby if a human/animal eats a small amount of something which is harmful - they avoid it whenever they come into contact with it again. aquired 24hrs after contact.if they are to survive dont want to repeat mistake
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Garcia et al (BS)
1st to study bait shyness in the lab. Rats who had been made ill through radiation after eating saccharine developed an aversion to it - associated illness with it
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Bernstein + Webster
Gave pps novel ice cream b4 chemotherapy +found they developed a taste aversion to ice cream. - linked illness with ice cream. IMPLICATION FOR CANCER PPS
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Medicine effect?
Not only can animals develop a taste aversion in order to ensure survival , but also can learn a preference for food which makes them healthier - e.g. food eaten before recovering from illness
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Garcia et al (ME)
Found when a distinctive flavour is presented to thiamine deficient rats + followed by injection of thymine ,they required a preference for the taste
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Implication?
Chemo patients - have to change the food before chemi
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Card 2

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What does EAA mean?

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refers to the environment in which a species 1st evolved

Card 3

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What was the early human diet like + why?

Back

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Card 4

Front

What 3 main areas are looked at?

Back

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Card 5

Front

What evidence is their for the preference of meat?

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