I always hear how we’re so susceptible to obesity and other problems from high calorie and high fat diets because our bodies have evolved to store that energy due to the difficulty in finding food for most of human existence.
Since skinniness is attractive and thus a sexual asset, I would expect people who can eat whatever they want and not get fat to be having more kids than overweight people who are not attractive by modern standards. At some point, I’d expect those lucky genes to be passed down so that we’ll see more people able to eat whatever they want and not gain weight and not drop dead from heart attacks. Is there any evidence this is actually happening? I know it’s only been a short time in human history, relatively speaking.