You’ve seen the brightly colored hand-sized bottles on supermarket shelves for decades, suggesting that their liquid contents will keep you properly hydrated with the minerals you need to go the long miles in top gear. However, hard core endurance athletes may not be getting what they’re bargaining for when they pick up their favorite sports drink, according to Stanford researchers.

The study reveals the benefits those sports drinks actually deliver when the effects of dehydration, and exercise-associated hyponatremia set in among serious endurance athletes.

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