Recently I watched an episode of Dr. Phil, featuring people with odd eating habits/compulsions, including a woman who ate chalk, and a (quite thin) woman who drank roughly a CASE of regular cola every day - in addition to her regular meals (she didn't say how much she eats, but did say that she didn't live on soda alone that she ate meals too).
So she's taking in anywhere from 3600 calories (if she does eat nothing else) to 5600 calories (if she eats an average amount of food). Not to mention the caffeine (about the equivalent of 6 - 8 cups of coffee).
It's incomprehensible that she's so thin (and looks so normal). The caffeine (as a stimulant) probably helps, but what kind of metabolism would she have to have to maintain a normal weight at this calorie level?
I'm guessing it will eventually catch up to her with health problems (even if none of them happen to be obesity), but I think it does suggest that some people do seem to somehow burn any extra calories, no matter how many they take in (she didn't report a lifestyle active enough to warrant the extra calories).
My brother was like that in his teens - no matter how much he ate, he never seemed to put on enough weight, but he was crazy active and was growing vertically at the time too.
I have to admit that my first reaction was envy of her metabolism, but even on the best metabolism that much sugar has to be doing some serious damage.
Maybe she was exagerating her cola consumption to get onto television. As much as I do see people with apparently very different metabolisms, I just can't wrap my head around an extra 3600 calories of sugar every day. Do you think she had to be lying/exagerating or do you know someone like this?