Foryears now, we have been hearing the importance of hydration toavoid heat stroke during prolonged exercise in hot weather. Now, itturns out, too much hydration can kill you.

• 在炎热天气做耗时的体育运动，必须大量补水以防中暑，其重要性多年以来已深入人心。但现在证明过量饮水也可能致人于死地。