Nutrition
Insoluble Fiber Pre-Run Risk
Insoluble fiber pre-run risk is urgency from bran and bulky salads close to long runs—shift high-residue meals earlier, not the night before key sessions.
Insoluble fiber pre-run risk spikes when bran, raw vegetables, or bulky salads sit in the colon hours before a long run—adding mechanical residue that jostling empties urgently. Soluble fiber behaves differently; timing matters more than banning all plants.
Shift high-bulk meals to lunch two days out, not race eve.
Common questions
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Should runners avoid all fiber before races?
Avoid large insoluble loads 24 hours out; keep familiar moderate soluble sources if tolerated. Blanket zero-fiber plans can constipate then rebound with urgency.
Related terms
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