Effects of green tea catechins with or without caffeine on energy expenditure and fat oxidation: a meta-analysis
Hursel R, Viechtbauer W, Dulloo AG, Tremblay A, Tappy L, Rumpler W
Published in Obesity Reviews
Methodology
Meta-analysis of randomized trials measuring 24-hour energy expenditure and fat oxidation after catechin and caffeine ingestion.
Key Findings
Catechin-caffeine mixtures raised 24-hour energy expenditure by roughly 4-5% and increased fat oxidation; catechins alone had smaller effects.
Conclusions
Green tea catechins with caffeine produce a small measurable rise in metabolic rate.
Limitations
Habitual caffeine intake modifies response; effects are small in absolute terms.
Supplements Studied
Catechin-caffeine mixtures raised 24-hour energy expenditure by roughly 4-5%
Outcomes Measured
Catechin-caffeine mixtures raised 24-hour energy expenditure by roughly 4-5% and increased fat oxidation
Catechin-caffeine mixtures raised 24-hour energy expenditure by roughly 4-5% and increased fat oxidation
Green tea preparations produced modest reductions in body weight of limited clinical significance
Green tea catechins with caffeine increased energy expenditure and fat oxidation.
Study Details
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