As a hypothetical question - what is considered a drug?

Well as far as performance enhancing drugs that shouldn't be allowed, it's quite clear.

A drug is a synthetically prepared chemical compound that has been engineered to allow otherwise unnatural growth, and/or to aid recovery. When taken it allows the user to grow larger muscle and recover from training much more effectively had they not taken the substance.

Your examples with food are good, however they are completely natural and will not put your body in a state of 'hyper' growth or recovery. Nor will they put any extra strain on your heart (as long as you eat normally).

It is a shame about the reward aspect, however even when athletes were technically amateur at the Olympics we still had rife cheating... I guess they were still being rewarded via endorsements.

It's a crying shame really :-(

Cg