A professor suggests that the increasing problem of obesity in the United States might be attributable to an inherited predisposition to love the taste of sweets and fats. Although these foods were difficult for ancestors to find, they helped them to survive famines. Now, these foods are easily available and Americans are eating too much of them. What field does this theory belong to?

evolutionary psychology

Explanation:

Evolutionary psychology -

It refers to the theory , according to which the social and environmental are influenced by the process of evolution , is referred to as evolutionary psychology .

Evolution with time is very important in this field of psychology .

The study varies or alters as the evaluation process takes place .

Hence , from the given scenario of the question ,

As the people gets addicted and used to more sugars and fat , the issue of obesity arises , but in previous times there were no access to harmful fats and sugar , and hence people were less prone to any case of obesity .

The correct term is evolutionary psychology .