[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).