Rice cakes have long held a “healthy” reputation, but the staple diet snack is practically empty—nutritionally speaking. Yes, they do boast a low calorie count, but athletes need calories to keep their energy levels up. Not to mention these crunchy little snacks will send your blood sugar soaring. Rice cakes can have a glycemic index as high as 91, not far off from pure glucose, which has an index of 100. For better carbs, grab an English muffin or some fruit instead, suggests White.