If it wasn't for "luck of the draw" as far as genetics go, I would be huge.
Thanks, mom and dad.
But seriously, I can see the difference between my cravings and even the way my body handles the same food before my concussions and while I'm still healing from them. I was literally eating the very same food that had me losing weight and feeling healthy, but I started putting on pounds and barely being able to control the urge to stuff my face with crap. And sometimes I'm not really all that successful.
It's getting better, slowly but surely, but I can honestly see how someone could get into a really horrific downward spiral, especially if they have everyone encouraging them to eat whole wheat and low fat, replacing meat with soy burgers.