It is definitely false that sexual awareness is usually not a significant issue during adolescence.
In fact, it is one of the most important issues during that period.
The answer is sweat glands, not sweet glands :)
Pretty much all the other answers don't come even close for consideration. Small intestines have no way of excreting salts and water outside our body and neither do adrenal glands (these are resposible for the release of different hormones).
From the context of the question, I am going to say placebo. This is me assuming, however, that both groups were told that their drinks had the protein powder
