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Strong Support

If untrained guys eat a high-fat diet for 7 weeks, they burn more fat during exercise than if they eat a high-carb diet.

43
Pro
0
Against

Evidence from Studies

Supporting (1)

43

Community contributions welcome

43

Fat utilization during exercise: adaptation to a fat‐rich diet increases utilization of plasma fatty acids and very low density lipoprotein‐triacylglycerol in humans

Cohort Study
Human
2001 Dec 15

The study found that men who ate a high-fat diet for 7 weeks burned more fat during exercise than those on a high-carb diet, which is exactly what the claim says.

Contradicting (0)

0

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Fat utilization during exercise: adaptation to a fat‐rich diet increases utilization of plasma fatty acids and very low density lipoprotein‐triacylglycerol in humans

Score: 43
DOI: 10.1111/j.1469-7793.2001.01009.x

Similar Assertions

When people with excess body fat eat very few carbs and more fats, their bodies burn more fat for fuel during intense exercise, as shown by lower respiratory exchange ratio measurements.

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If elite male cyclists eat a super high-fat diet for six days, their bodies get better at burning fat for fuel — even when they switch back to eating lots of carbs for a day.

50
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Even after endurance athletes eat lots of carbs for a day, their bodies still burn more fat than usual if they recently spent a week on a high-fat diet.

0
26
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When endurance athletes eat a high-fat diet for 6 days, their bodies burn less carbs during a long bike ride compared to when they eat a high-carb diet — showing their metabolism switches to using more fat for fuel.

26
0
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If endurance athletes eat a high-fat, low-carb diet for just 6 days, their bodies burn way more fat during a long bike ride — about 50 grams more over 4 hours — compared to when they eat lots of carbs, even if they're used to carb-heavy diets.

26
0
75%