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Evolutionary explanation- Originates from hunter gatherers.

Animals and plants. Fatty food prefernces adaptive- energy sources vital. Modern humans- concered about nutrition value but have a tendency to go towards foods high in calories.In EEA hard to gain calories. explains why humans may have evolved to preference especially in foods rich in calories to provide more energy.

Preference of meat-

declining vegetation.so needed to gain energy from animal based foods.e.g animla organs like liver, kidneys and brains which are extremely rich sauces of energy. Due to meats high level of nutrition. some say it was the catalyst for the development of the brain as provided important aa which plants would of not provided.

Milton claims - couldn't of secured enough nutrients from vegetation alone to become active and intelligent as we are today.

Our preference for meat could be explained by receding forests but also the nutritional value and development it supplied our brain.

sweet + sour

foods.

Early diets

*evolutionary adv- due to high energy and non toxic.

*detect and reject bitter and sour tasting foods- indication of poisons and toxin- decrease chance of survival if cant detect. explains why we don't enjoy sour and bitter tastes. Evolved to have genes to recognise bitter tasting foods.

Support for this evolutionary explanation for bitter/sour. children have been found to be more sensitive to bitter tastes.- fits with evolutionary expectations. Lack enviromenatal experience- to ^ survival. being more sensitive to bitter foods allows to know what is safe to eat.

learn Taste aversion to foods that are toxic can be explained through evolution - develops when food toxic develop a dislike due to sickness.

Advantages- Survive- avoid food in future as develop a dislike for it.Once aversion has occurred hard to change- adaption designed to keep ancestors a live odour can also be linked to illness and cause food aversion.

First discovered rats and poison. Garcia- rats who were made ill through radiation shortly after eating saccharin. developed a aversion to it and associated illness with saccahrin.

Medicine effect.- animals learn a preference that makes them healthier. food eater after recovery from illness.

Garcia- rat with thymine deficiency consumed food with a distinctive taste- followed by a thymine injection. develop a preference for this food.

Evolutionary advantage as would keep healthy and survive. example salt preference. important for sodium chloride levels and controlling muscular and neural activitys- adaption aid survival.