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The body relies on glycogen to keep your blood sugar levels stable and maintain your energy. Thus, you don’t need much fiber. Foods that have a high carb/fiber ratio can irritate the digestive tract, which can become problematic prior to working out, Meghan Doherty, BSN, and nutrition consultant for Madsweat, says. A slow-digesting carbohydrate that contains 5-10 grams of fiber is necessary for pre-cardiovascular exercises.