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A meta-analysis of 15 RCTs (n=1,945) found that green tea catechins containing EGCG significantly increased fat oxidation by 16% and 24-hour energy expenditure by ~100 kcal/day compared to placebo, with the greatest effects during exercise.
| Study | Participants | Finding | Quality |
|---|---|---|---|
Green tea catechins, caffeine and body-weight regulation Hursel R, Viechtbauer W, Westerterp-Plantenga MS — International Journal of Obesity (2009) | 1,945 | Catechin-caffeine mixtures significantly increased energy expenditure and fat oxidation vs caffeine alone | High |
Ingestion of a tea rich in catechins leads to a reduction in body fat and malondialdehyde-modified LDL in men Nagao T, Hase T, Tokimitsu I — American Journal of Clinical Nutrition (2007) | 240 | Continuous ingestion of 690mg catechins for 12 weeks reduced body fat area, skinfold thickness, and LDL cholesterol | High |
For enhanced fat oxidation, 400-500mg of EGCG from green tea extract taken 30-60 minutes before exercise can meaningfully increase fat burning. Combining with moderate-intensity cardio amplifies the effect. Caffeine-naive individuals see the greatest thermogenic benefit.
A meta-analysis of 15 randomized controlled trials investigating the effects of green tea catechins (EGCG) on fat oxidation, thermogenesis, and body composition in overweight and obese adults.
Yes. A meta-analysis of 15 RCTs found green tea catechins (EGCG) increased fat oxidation by 16% and boosted 24-hour energy expenditure by about 100 calories per day. The effect is modest but statistically significant, especially when combined with exercise.
Clinical trials showing meaningful fat oxidation benefits used 270-800mg of EGCG daily, with 400-500mg being the most commonly effective dose range. Taking it 30-60 minutes before exercise maximizes the thermogenic effect.
Research shows the combination of EGCG and caffeine produces greater fat oxidation than caffeine alone. EGCG inhibits catechol-O-methyltransferase (COMT), which prolongs norepinephrine signaling and enhances thermogenesis beyond what caffeine achieves independently.
Doses above 800mg EGCG per day have been linked to liver enzyme elevations in rare cases. Most clinical trials report good tolerability at 400-500mg/day. Taking with food and avoiding fasted mega-doses reduces the risk of hepatotoxicity.