The effect of green-coffee extract supplementation on obesity: A systematic review and dose-response meta-analysis of randomized controlled trials 

This 2019 paper is a comprehensive systematic review and dose-response meta-analysis of all available randomized controlled trials (RCTs) undertaken to examine the effect of GCE and CGA intervention on body weight (BW), body mass index (BMI) and waist circumference (WC) in adults. A total of 13 articles with 16 RCTs were included in the meta-analysis. Results revealed significant reduction in BMI and greater reduction in body weight in individuals with a BMI over 25. Supplementation duration of less than 4 weeks had no effect.  

References:

Gorji, Z., Varkaneh, H. K., Talaei, S., Nazary-Vannani, A., Clark, C. C. T., Fatahi, S., Rahmani, J., Salamat, S., & Zhang, Y. (2019). The effect of green-coffee extract supplementation on obesity: A systematic review and dose-response meta-analysis of randomized controlled trials. Phytomedicine : international journal of phytotherapy and phytopharmacology, 63, 153018. https://doi.org/10.1016/j.phymed.2019.153018