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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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green tea and Reduced Body Mass Index

Research synthesisModerate evidenceMixed effect size4 studies · 3 beneficial · 1 neutral · 0 harmful

Across 4 meta-analyses, 3 reported statistically significant beneficial effects of green tea on reducing body mass index (BMI), with effect sizes ranging from small to large. The predominant effect direction is beneficial, with a moderate-to-mixed effect size (small to large across studies). The most common population studied was overweight or obese adults, and effects were typically small to moderate in magnitude, though one meta-analysis reported a large effect (SMD: -1.2).

  • Studied populations: overweight and obese adults, postmenopausal women

Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Evidence base is small (only 4 studies) — conclusions should be considered preliminary. Doses were not consistently reported, making specific dose recommendations unavailable.

Generated Jun 15, 2026
4 of 4 papers
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