When endurance athletes do high-intensity interval training at very hard effort (over 85% of their maximum oxygen capacity), they burn fat at extremely high rates - about 1.58 grams per minute on average, with some burning over 1.85 grams per minute. These are the highest fat-burning rates ever measured in people.

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Evidence from Studies

Supporting (1)

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Low carbohydrate high fat ketogenic diets on the exercise crossover point and glucose homeostasis

Narrative Review

2023

The study shows athletes on a low-carb high-fat diet achieved those exact fat oxidation numbers during high-intensity running, but the claim doesn't mention the diet part - it just describes the exercise. The numbers match perfectly, so the evidence supports what the claim says happened, even though the claim leaves out the important role of the diet.

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Source Study

Low carbohydrate high fat ketogenic diets on the exercise crossover point and glucose homeostasis

Score: 1

DOI: 10.3389/fphys.2023.1150265

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