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NancyLebovitz comments on What is the evidence in favor of paleo? - Less Wrong
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From casual observation, paleo and intermittent fasting are the only diets that some people seem to like being on, as distinct from being burdens that some people think are worth the trouble.
That doesn't logically imply that the diet is good for people. People enjoy a diet of sweets, too.
I tend to assume that things people hate are bad for them. CR may be an exception, but it's plausible that evolution would usually select for warnings that one is hurting oneself.
People tend to like food that is harmful. And they tend to dislike diets that are potentially useful: most people fail to diet through failure of will, i.e. because the diet is not fun. So the evolutionary heuristic seems not to hold for food.
There are different theories why people like harmful food, but all of them try to explain the fact that they do like it. E.g., it is a purposely designed superstimulus due to competition between food sellers. Or, people evolved to want energy rich food that was rare in the ancestral environment, and when it is plentiful they actually overeat. Etc.
I do know vegans who like being vegan.