Key takeaways
- A Cochrane review found green tea gave no meaningful weight loss in adults with overweight or obesity.
- Catechin and caffeine combinations show small effects at best.
- High-dose green tea extracts have been linked to liver injury. A cup of matcha is a different matter.
What the evidence shows
The Cochrane review of green tea for weight loss and maintenance in overweight or obese adults found differences of a fraction of a kilogram between green tea and placebo, which is not clinically meaningful. An earlier meta-analysis found a small effect that appeared mostly in studies where people also had caffeine, and it disappeared in studies where habitual caffeine intake was high.
Why the number on the scale barely moves
Weight changes come from the gap between calories eaten and calories burned. A catechin boost to metabolism is tiny next to that gap, and the body adapts as weight falls. Find your real numbers with the real TDEE finder, watch your progress with the weight trend smoother and plan a pace with the goal planner.
Matcha as a drink
Matcha is ground whole tea leaf, so you drink more of the leaf than in steeped tea. It contains caffeine, typically a few dozen milligrams per serving, so keep an eye on timing with the caffeine clock. It is a pleasant, low-calorie drink if you swap it for a sugary one.
Safety of concentrated extracts
European food-safety reviewers concluded that green tea catechins taken as supplements, especially EGCG at around 800 mg a day or more, can cause liver injury in some people. Tea or matcha drunk as a beverage has not been linked to the same problem.
A product to consider
Matcha Extreme
Per the seller’s page, the drink mix combines matcha with spirulina, prickly pear (opuntia) extract and acerola.
- It is essentially a flavored green tea blend, so it is unlikely to be harmful for most healthy adults.
- Swapping a sugary drink for it can trim calories.
Consult your doctor before use, especially if you are pregnant or breastfeeding, have a medical condition or take medication. This product is not intended to diagnose, treat, cure or prevent any disease.
Try the related tools
Real TDEE finder · Weight trend smoother · Goal planner · Caffeine clock
Sources
- Jürgens TM et al. Green tea for weight loss and weight maintenance in overweight or obese adults. Cochrane Database Syst Rev 2012. Find on PubMed
- Hursel R et al. The effects of green tea on weight loss and weight maintenance: a meta-analysis. Int J Obes 2009. Find on PubMed
- EFSA Panel on Food Additives and Nutrient Sources. Scientific opinion on the safety of green tea catechins. EFSA Journal 2018. Find on PubMed
- Hall KD et al. Quantification of the effect of energy imbalance on bodyweight. Lancet 2011. Find on PubMed
Links open a PubMed search for each paper so you can read the abstract and full citation. Always check the original study.