To put it simply and honestly: matcha does not help you lose weight. No health claims regarding the effect of green tea on body weight have been authorised in the European Union, as the evidence was deemed insufficient. What matcha can actually do is more modest: it can replace a high-calorie drink. It’s worth knowing where the limits lie.
Where did this claim come from?
From research into catechins, mainly EGCG, and caffeine, including experiments on cells and animals. The headlines were quick to apply those results to people on a diet.
Studies in humans have given inconsistent results, often at catechin doses higher than those found in a few cups of tea. The European Food Safety Authority (EFSA) analysed this data and concluded in its opinion that a cause-and-effect relationship had not been established, so the EU has not authorised a weight-loss claim. This is not a mere formality — it means that the evidence was insufficient.
What matcha actually does
It replaces calories. A cup of matcha made with water contains practically zero calories. If it replaces a syrup-laden latte or a cola, the difference over the course of a day is significant – and that’s arithmetic, not metabolism.
It adds caffeine. A 2 g serving contains about 60–70 mg, a little less than an espresso. That caffeine adds up with your coffee, and in the evening it acts just like the caffeine in coffee. We’ve put the figures together in our article on how much caffeine is in matcha.
Take note of what’s missing from this list. There’s no fat burning, no metabolism boosting and no detoxification. If someone were to sell you matcha using these claims, they’d be selling you something that contravenes food law.
Where matcha can be detrimental to your diet
Most often in a cup. A matcha latte made with milk and syrup contains 150–250 kcal – the same as a dessert. If you drink three a day ‘because it’s healthy’, your calorie balance may end up in the red despite your good intentions. Matcha itself has almost no calories; the additives do.
The second thing to consider is iron. The polyphenols in tea limit the absorption of plant-based iron, so if you’re on a meat-free diet, it’s better to drink matcha between meals rather than with them. You can read more about this in the article on its properties and side effects.
How to drink matcha if you’re counting calories
With water, without sugar, as a replacement for another drink – not as an addition to what you’re already drinking. In EFSA’s opinion, up to 400 mg of caffeine a day from all sources raises no safety concerns for healthy adults, and a 2 g serving of matcha has about 60–70 mg. Agree the number of cups with your doctor. Ceremonial matcha works better on its own, as it is naturally sweeter and doesn’t need the bitterness masked.
And the most important thing, though the least catchy: no drink can replace a calorie deficit. Matcha can be a pleasant part of a day where you eat sensibly. It’s not a shortcut around that.
Frequently asked questions
Does matcha burn fat?
No. Catechins and caffeine have been studied for this, but EFSA did not consider a link with body weight established, and the EU has not authorised any weight-loss claim.
Does a matcha latte make you put on weight?
A latte made with milk, especially with syrup, usually contains 150–250 kcal. It’s comparable to a snack — if you’re counting calories, make sure to include it in your total.
Does drinking matcha on an empty stomach help you lose weight?
No. Matcha does not help you lose weight, on an empty stomach or at any other time of day. However, some people experience stomach discomfort on an empty stomach, so if that’s the case for you, there’s no need to force yourself.
Matcha or green tea for weight loss?
Neither has a proven effect on body weight. Matcha has more catechins and caffeine per serving, but that does not change the conclusion, so choose whichever you prefer to drink without sugar.
Does matcha cleanse the body?
‘Detox’ is a marketing term, not a physiological one — your liver and kidneys are responsible for cleansing. Matcha doesn’t speed up their work, and no one has shown that it does.
How much matcha a day should you have whilst trying to lose weight?
No number of cups makes you lose weight, so there is no amount for us to give. What counts is caffeine: in EFSA’s opinion, up to 400 mg a day from all sources raises no safety concerns for healthy adults, and a 2 g serving of matcha has about 60–70 mg. Agree the number of cups with your doctor.
