How unhealthy is it to drink sports drinks when your not working out? If I drink propel or gaterade during lunch and dinner, in addition to during tennis and working out, is this unhealthy? I've been told that drinking sports drinks outside of physical activity just creates extra carolies to burn off. If thats the case, I don't care much because I'm a pretty active person who probably does at least 15hrs of physical activity a week; but I've also heard things like drinking too much gaterade can cause kidney stones. That's not good. Can anyone clear this up for me?