Hursel, R. Viechtbauer, W. Dulloo, Abdul G. Tremblay, A. Tappy, L. Rumpler, W. Westerterp-Plantenga, M. S. 2011-03-02 Different outcomes of the effect of catechin-caffeine mixtures and caffeine-only supplementation on energy expenditure and fat oxidation have been reported in short-term studies. Therefore, a meta-analysis was conducted to elucidate whether catechin-caffeine mixtures and caffeine-only supplementation indeed increase thermogenesis and fat oxidation. First, English-language studies measuring daily energy expenditure and fat oxidation by means of respiration chambers after catechin-caffeine mixtures and caffeine-only supplementation were identified through PubMed. Six articles encompassing a total of 18 different conditions fitted the inclusion criteria. Second, results were aggregated using random/mixed-effects models and expressed in terms of the mean difference in 24 h energy expenditure and fat oxidation between the treatment and placebo conditions. Finally, the influence of moderators such as BMI and dosage on the results was examined as well. The catechin-caffeine mixtures and caffeine-only supplementation increased energy expenditure significantly over 24 h (428.0 kJ (4.7%); <em>P</em> < 0.001 and 429.1 kJ (4.8%); <em>P</em> < 0.001, respectively). However, 24 h fat oxidation was only increased by catechin-caffeine mixtures (12.2 g (16.0%); <em>P</em> < 0.02 and 9.5 g (12.4%); <em>P</em> = 0.11, respectively). A dose-response effect on 24 h energy expenditure and fat oxidation occurred with a mean increase of 0.53 kJ mg⁻¹ (<em>P</em> < 0.01) and 0.02 g mg⁻¹ (<em>P</em> < 0.05) for catechin-caffeine mixtures and 0.44 kJ mg⁻¹ (<em>P</em> < 0.001) and 0.01 g mg⁻¹ (<em>P</em> < 0.05) for caffeine-only. In conclusion, catechin-caffeine mixtures or a caffeine-only supplementation stimulates daily energy expenditure dose-dependently by 0.4–0.5 kJ mg⁻¹ administered. Compared with placebo, daily fat-oxidation was only significantly increased after catechin-caffeine mixtures ingestion. application/pdf https://folia.unifr.ch/global/documents/302074 https://folia.unifr.ch/documents/302074/files/dul_ecr.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1467-789X.2011.00862.x info:eu-repo/semantics/openAccess License undefined Obesity Reviews. - 2011, vol. 12, no. 7, p. e573–e581 Caffeine catechins green tea oolong tea info:eu-repo/classification/udc/613.2 The effects of catechin rich teas and caffeine on energy expenditure and fat oxidation: a meta-analysis http://purl.org/coar/resource_type/c_6501