Can you run fast on a low-carb diet?
Does a low-carbohydrate diet impede endurance sports performance? No
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Athletes who ate mostly fat and little carbs for a month could run just as well as those who ate lots of carbs — as long as they sipped a little sugar during long workouts.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 553 / 90
Evidence Score
Participants are randomly assigned to treatment or control groups, minimizing bias. Considered the gold standard for testing whether an intervention causes an effect.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Athletes who ate mostly fat and little carbs for a month could run just as well as those who ate lots of carbs — as long as they sipped a little sugar during long workouts.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 553 / 90
Evidence Score
Participants are randomly assigned to treatment or control groups, minimizing bias. Considered the gold standard for testing whether an intervention causes an effect.
Publication
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Claims (8)
People who follow a low-carbohydrate diet long-term experience normal energy levels and can perform daily activities without consuming carbohydrates.
After 4 to 6 weeks on a low-carbohydrate, high-fat diet, trained athletes show no reduction in their ability to perform repeated sprint efforts or achieve maximum oxygen uptake during endurance tests.
After four to six weeks on a low-carbohydrate, high-fat diet, trained athletes maintain the same endurance performance during high-intensity exercise tests, including time trials and prolonged cycling, and their bodies can sustain exercise up to 85% of VO2max without relying on muscle glycogen stores.
Trained athletes who consume 10 grams of carbohydrate per hour during extended moderate-intensity exercise experience a 12–22% increase in how long they can continue exercising, regardless of whether they normally eat low-carbohydrate or high-carbohydrate diets, because their blood sugar levels remain stable.
For trained athletes consuming 10 grams of carbohydrate per hour during exercise, the long-term balance of fats, proteins, and carbohydrates in their daily diet does not change their endurance performance.