Of course you do. So I was lying awake in the wee small hours of the morning wondering what evolutionary basis there could be for developing three different eating strategies. Presumably there is also a 4th eating strategy which all the thinnies have but which they are keeping a secret from us, the fat of the world.
So constant cravers are always on the lookout for food. Maybe their ancestors were primarily the gatherer-types who would wander through a landscape full of berries and edible roots. They were always looking out in the environment for things they could eat. They never had lots to eat in one go, but there was always food around if they looked out for it.
The feasters were the hunters. They didn't have food always available. But when they brought down a mammoth they had to eat as much of it as they could before everybody else did. So feast, feast, feast until all the food is gone, because you may not get another chance at mammoth for ages.
These seem like sensible strategies for survival in different environments. This is why these traits have survived into the modern day and are now not so helpful. It makes sense, because I always imagined myself having ancestors trekking through the ice, spear in hand, looking for mammoth.
But finally I got it. When we were hunter-gatherers and were faced by stress - like another tribe turning up who were stronger and wanted our territory, or a sabre-toothed tiger setting up its home nearby - it would be a good plan to eat everything in a fever-pitched, crazy emotional way, so that we were prepared for making a move, or getting into a fight, or some sort of activity that would require energy.
It all makes sense.
We are fat today because our ancestors were bloody good at surviving.
Except they stayed skinny.