I drink a lots of sports drink while playing soccer – and it really seems to help more than water – I recently switched to a zero calorie drink – with no apparent loss of efficacy. But I had no idea that the question of how sports drinks help was such a mystery – until I read about the research described here:It has long been known that sugary drinks and sweets can significantly improve athletes' performance in endurance events. The question is how?Clearly, 'sports' drinks and tablets contain calories. But this alone is not enough to explain the boost, and the benefits are felt even if the drink is spat out rather than swallowed. Nor does the sugary taste solve the riddle, as artificial sweeteners do not boost performance even when they are indistinguishable from real sugars.Writing in the...