"There is a striking lack of evidence to support the vast majority of
sports-related products that make claims related to enhanced performance
or recovery, including drinks, supplements and footwear." This study in the British Medical Journal does not really prove that sports beverages and other sports products are ineffective, but it does indicate that there is very little available evidence that confirms the many claims. Here's the list of the products they studied.
The people over in the Convocation Center might disagree on some points.
In case you'd like to read more: The BMJ article, a news article, and (my favorite) a blog post from a nutrition researcher. The latter also summarizes several other articles, including two questioning overemphasis on hydration and drinking when not thirsty.
Not that water and carbohydrates aren't important. (And rest!)
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