In the methodology used for this study, several databases were exhaustively searched from their inception to September 2019. The goal was to identify clinical trials that had explored the influence of green tea supplements on obesity indices in humans. The dosage, type of extract, and duration of the intervention were key factors for the study. The study design incorporated the use of a random-effects model to aggregate the collected data.

In terms of the study's results, they demonstrated notable changes in subjects' obesity indices following the administration of green tea. A significant reduction in body weight and body mass index was observed, which was consistent across all extracted data. The most noticeable change was observed in the reduction of waist circumference in subjects who were administered an equivalent of 800 mg/day of green tea. Also, a more significant reduction in body weight occurred with a green tea dosage of less than 500 mg/day and a treatment duration of 12 weeks. These results affirm the potential use of green tea in improving obesity indices and the study advocates for the inclusion of green tea supplements, combined with a balanced diet and regular exercise, in obesity management strategies.