[DanBC]

Bob eats more calories than Bob burns. Bob gains weight.

Ann eats more calories than Ann burns. Ann gains weight.

You can make a rough comparison between Ann and Bob - they eat extra calories, they gain weight.

There are some bugs that help people gain weight; there are some bugs that help people not gain weight. People do different amounts of exercise. People are lousy at recalling what they actually eat everyday. But, really, calories are calories.

> And thus it's entirely possible that a calorie-free substance, which has impacts on metabolism and how your body decides what to store, can impact weight gain.

I disagree, and I'd like some credible references. Unless you're talking about amphetamine sulphate.

[dllthomas]

> > And thus it's entirely possible that a calorie-free substance, which has impacts on metabolism and how your body decides what to store, can impact weight gain.

> I disagree, and I'd like some credible referenceys. Unless you're talking about amphetamine sulphate.

This seems self-defeating. Surely, for a claim that a particular substance has a particular effect, I would like to see evidence. But obviously the notion that a substance could have such an effect is well supported by the existence of amphetamine sulphate - and unless you believe amphetamine sulphate is imbued with some magical uniqueness, other substances may very well have greater or lesser effects in the same domain (though greater effects we'd probably have noticed and tested and have conclusive evidence for by this point).