Last reviewed: November 2026
There is no proven daily dose of green tea for weight loss. For most healthy adults, three to four cups a day is a sensible range, adding about 90 to 200 mg of caffeine. Research finds any effect on weight is small, so treat green tea as a supporting habit, not a fat burner.
That range is practical guidance, not a clinical dose. Reviews of the evidence do not identify an amount that reliably produces meaningful weight loss, which is why the more useful questions are how much is safe and what you can realistically expect. This guide answers both, with the numbers and where they come from. Related guides: how much weight you can lose with green tea and how much caffeine is in green tea.
How many cups of green tea a day is safe?
For brewed green tea, high intake has not been linked to liver damage. The European Food Safety Authority (EFSA) reviewed green tea catechins in 2018 and found no sign of liver damage from infusions, even with high consumption. It estimated that adults who drink large amounts can take in up to 866 mg of EGCG, the main catechin, from tea alone.
The picture changes for concentrated supplements. EFSA linked EGCG at 800 mg a day or more from supplements to early signs of liver damage in studies of volunteers, and said it could not identify a safe dose. The U.S. National Center for Complementary and Integrative Health (NCCIH) reports no safety concerns for green tea drunk as a beverage by adults. Our guide to green tea extract vs green tea explains the difference in detail.
How much caffeine will you get from green tea?
A cup of brewed green tea (8 oz, or 230 ml) contains about 30 to 50 mg of caffeine, averaging around 35 mg, according to Healthline. Brewed coffee has 102 to 200 mg in the same size cup. Longer steeping, hotter water and tea bags (compared with loose leaf) all release more caffeine.
The U.S. Food and Drug Administration (FDA) cites 400 mg a day as an amount not generally associated with negative effects for most adults. Because that limit covers all your caffeine, count coffee, energy drinks and other tea too. People also differ widely in how strongly they react to caffeine.
| Cups of green tea a day | Caffeine from the tea (30 to 50 mg per cup) |
|---|---|
| 2 | 60 to 100 mg |
| 3 | 90 to 150 mg |
| 4 | 120 to 200 mg |
| 6 | 180 to 300 mg |
| 8 | 240 to 400 mg |
At the top end, eight cups would use up the whole 400 mg FDA figure before any coffee. See the full breakdown in how much caffeine is in green tea.
Does drinking more green tea mean more weight loss?
Not reliably. A Cochrane systematic review (Jurgens and colleagues, updated 2021) pooled 15 weight-loss trials and 3 weight-maintenance trials in overweight and obese adults. In the six trials outside Japan that could be combined, green tea led to an average difference of just −0.04 kg compared with control, which was not statistically significant. The review concluded the effect was small and unlikely to be clinically important.
NCCIH takes a similar line: the catechins and caffeine in green tea “may have a modest effect on body weight”, depending on the product and how active you are. Read the numbers in full in how much weight you can lose with green tea.
What is the best way to drink green tea each day?
Based on the safety evidence, a few habits make sense:
- Spread your cups through the day. EFSA notes that infusions are usually drunk with food and spread through the day, unlike slimming supplements, which are often taken as one concentrated dose on an empty stomach.
- Choose it instead of sugary drinks. Unsweetened green tea has almost no calories, so the benefit is mostly what it replaces.
- Mind your last cup. If caffeine disturbs your sleep, have your final cup earlier in the day.
- Stick to brewed tea. It is the form the safety evidence supports best.
No best time of day for weight loss has been established in the sources reviewed for this article.
Who should drink less green tea?
NCCIH advises that during pregnancy, caffeine intake should not exceed moderate levels, and that anyone pregnant or breastfeeding should ask a health professional. High doses of green tea or its extract can also lower blood levels of some medicines, including nadolol and atorvastatin. If you take any medication, read green tea side effects and who should avoid it first.
Frequently asked questions
How many cups of green tea should I drink a day to lose weight?
There is no proven amount. Three to four cups a day is a sensible range for most healthy adults and adds about 90 to 200 mg of caffeine, but research shows any weight effect is small.
Is it safe to drink green tea every day?
For most adults, yes. NCCIH reports no safety concerns for green tea drunk as a beverage, and EFSA found no sign of liver damage from infusions. Watch your total caffeine, and avoid concentrated extracts unless a doctor advises them.
Can you drink too much green tea?
Yes, mainly because of caffeine. At 30 to 50 mg per cup, eight cups could reach the 400 mg a day the FDA cites, before counting coffee. Concentrated supplements are a bigger concern than brewed tea.
Does it matter when I drink green tea?
No best time for weight loss has been established. Practical factors matter more: spread cups through the day, drink them with food if you can, and avoid late cups if caffeine affects your sleep.
Sources
- Green tea for weight loss and weight maintenance in overweight or obese adults, Cochrane review
- EFSA assesses safety of green tea catechins, 2018
- Green tea, NCCIH
- Caffeine in green tea, Healthline
- Spilling the beans: how much caffeine is too much, FDA
This article is general information, not medical advice. Speak to a doctor before changing your diet or taking supplements, especially if you are pregnant, take medication or have a liver condition.
