Members of the fat acceptance movement perceive negative societal attitudes as persistent, and as being based on the presumption that fatness reflects negatively on a person's character.
Such drift may have started because around 2 million years ago ancestral humans effectively removed the risk from predators, which was probably a key factor selecting against fatness.
Many human and animal studies have shown that nutrition in early life can influence, in adulthood, such things as body fatness, blood lipids, blood pressure, atherosclerosis, behavior, learning and longevity.
