Comment Re:Isn't this just bulimia? (Score 2) 483
we've evolved to fatten up when food is plentiful so that we don't starve when food is scarce
Not quite.
We've evolved to fatten up to a limited extent when food is plentiful, and to adapt our metabolism to a wide extent whether that supply remains plentiful or shortens up. That's what gives reproductive advantage. For hundreds of thousands, if not millions, of years our ancestors lived a life of plenty as hunter-gatherers (see "Stone-age economics, by Marshall Sahlins) and "when food is scarce" was a rare occurrence that they hardly ever cared to prepare for.
Fattening up without limit, turning obese and diabetic earlier and earlier, and developping cardiovascular disease in ripe age, gives no reproductive advantage and is thus not an evolved trait. They're disease, or more accurately symptoms of a deeper disease of the human metabolism's hormonal regulation system, and it's most probably caused by the foods that did not play a role in our long evolution, foods that were introduced very recently and do affect our hormones.