This little bastard has ruined more diets than pizza delivery.
That's only the beginning of your body's campaign of biological terrorism. Once that cozy layer of insulation succeeds in wrapping you up, your body will fight like hell to keep it there. According to Dr. Sharma, "It doesn't matter how you put on the weight; once you do, your physiology resets the way it works to defend the weight. And it pretty much does so permanently." He likens the process to setting a thermostat in a room. Once it's set for, say, 300 pounds, that's where your body will stay. Dieting is like opening a window -- you might catch a slight breeze, but the heater is gonna crank it up to compensate. This would be why, statistically, the success rate of every diet rounds down to zero.
It doesn't help that lots of diets range from stupid to life-threatening.
But you have to get there in the first place, and getting there involves Hoovering up every sandwich that has the misfortune of crossing your path, right? That's why the fat guy in the movie always has an obscenely enormous, greasy cheeseburger hanging out of his disgusting maw. But Rachel is scandalized by the diets of the fictional fat, too. "I remember this one lady [on TV], she ate like a pound of bacon and a dozen eggs for breakfast, and I was like, 'Holy mother, how does she eat that much?'" she says.