People say green tea helps you burn fat by blocking a specific enzyme in your body, but no one has actually proven this happens in real humans—only in test tubes or animals.

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Evidence from Studies

Supporting (1)

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The effect of green tea extract on fat oxidation at rest and during exercise: evidence of efficacy and proposed mechanisms.

Narrative Review

2013 Mar 1

The study says green tea might help burn fat, but no one has proven yet that it works by blocking the COMT enzyme in real human bodies—just in test tubes or animals. So the claim is right.

Contradicting (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

The effect of green tea extract on fat oxidation at rest and during exercise: evidence of efficacy and proposed mechanisms.

Score: 1

DOI: 10.3945/an.112.003269

Similar Assertions

Drinking green tea extract might help some people burn more fat while sitting around, with studies showing about a 16% boost on average—but it doesn’t work the same for everyone because the tea’s ingredients and your body type can change the results.

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If you drink green tea extract every day for at least three months and also do regular cardio like running or cycling, your body might burn more fat during your workouts—up to a quarter more than if you didn’t take the extract.

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Drinking green tea extract for a long time might help animals burn fat better by turning on certain genes in their liver and muscles, but we don’t know yet if this happens in people too.

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Drinking green tea extract can help your body burn more fat over a full day—even if you remove the caffeine from it.

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If you drink less than about three cups of coffee a day, green tea extract might help you burn fat better—but if you’re already a big caffeine drinker, it might not help as much.

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77%