Nutrition
Fructose Malabsorption Running
Fructose malabsorption running causes bloating and urgency when free fructose in gels or fruit overwhelms absorption—some need glucose-only race fuel.
Fructose malabsorption running is poor absorption of free fructose in sports products or fruit—causing bloating, gas, and trots when gels, honey, or apple juice load up mid-run. Some athletes tolerate fructose only when paired with glucose in a two-to-one blend; others need glucose-only fuel.
Diagnosis is clinical, not guesswork from one bad race.
Common questions
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Can you fix fructose issues by gut training alone?
Some people adapt with low doses paired with glucose; others never tolerate high fructose. If symptoms persist, simplify fuel and discuss testing with a clinician.
Related terms
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