A new meta-analysis of randomized controlled trials has found that supplementation with green tea extract can increase the rate at which the body burns fat during and after exercise, according to a review published in a peer-reviewed nutrition journal. The analysis, which pooled data from nine randomized controlled trials, examined how green tea extract affects substrate oxidation — the process by which the body uses carbohydrates or fats for energy. Researchers reported that participants who consumed green tea extract showed significantly higher fat oxidation both during exercise and in the post-exercise recovery period compared to control groups. The findings add to a growing body of evidence that green tea compounds, particularly catechins like epigallocatechin-3-gallate (EGCG), may support metabolic health by shifting fuel utilization toward fat. Earlier studies have also confirmed that green tea extract can increase fat oxidation and improve insulin sensitivity in healthy young adults, according to reporting by Mercola.com [1].
Study Methodology and Key Results
The meta-analysis reviewed data from nine randomized controlled trials that examined the effect of green tea extract supplementation on substrate oxidation during exercise. Researchers measured rates of fat oxidation and carbohydrate oxidation during exercise sessions and during the subsequent recovery period. The analysis also included a dose-response assessment to determine whether higher doses of green tea extract produced greater effects. According to the findings, participants who took green tea extract burned more fat during exercise and continued to show elevated fat oxidation after exercise had ended. In addition, carbohydrate oxidation decreased during the post-exercise recovery period in the green tea group, indicating a shift away from carbohydrate use and toward greater fat utilization. A prior study involving 12 healthy men who performed a 30-minute cycling exercise before and after taking green tea extract similarly found increased fat oxidation rates, as reported by Mercola.com [1]. The consistency of these results across multiple trials strengthens the evidence that green tea extract can influence fuel selection during physical activity, according to the researchers.
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