When you fast and drink green tea high in EGCG, your body burns fat better because it keeps a fat-burning hormone (epinephrine) active longer and lowers insulin, which normally blocks fat burning.

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.

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.

Drinking green tea supplements for up to a year can slightly lower your fasting blood sugar by about 1.4 points — and it seems to help your body manage sugar better, not just by coincidence.

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.

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