You’ve been sold a myth about sports drinks – and it could be slowing you down

TheConversation: From eight glasses of water a day to protein shakes, we’re bombarded with messages about we should drink and when, especially during exercise. But these drinking dogmas are relatively new. For example, in the 1970s, marathon runners were discouraged from drinking fluids for fear that it would slow them down. Now we’re obsessed with staying hydrated when we exercise, not just with water but with specialist drinks that claim to do a better job of preventing dehydration and even improve athletic performance. Yet the evidence for these drinks’ benefits is actually quite limited.