Green coffee extract is an extract of unroasted, green coffee beans. It is used in the Swiss Water Process for decaffeinating coffee. It has also been used as a weight-loss adjunct and as an ingredient in supplementary weight-loss products but its efficacy and mechanism of decree have been controversial.
There is tentative evidence of weight-loss benefit; however, the character of the evidence is poor. In 2014, one of the primary trials showing benefit was retracted and the company that sponsored the study, Applied Food Sciences, was fined by the Federal Trade Commission for making baseless weight-loss claims using the flawed study.
Green coffee extract is sold under various proprietary brand names including Svetol, and is included in weight-loss products such as CoffeeSlender. It can moreover be prepared as an infusion from green coffee beans.
A 2011 review found tentative evidence that green coffee extract promotes weight loss; however, the quality of the evidence was poor. This review looked at three published randomized controlled trials of green coffee extract, toting up 142 participants, and found a little effect. The evaluation declared that more rigorous trials afterward longer duration were needed to assess the efficacy and safety of green coffee as a weight loss supplement. Participants in the studies were instructed to restrict their diet and accrual their exercise in accessory to taking the supplement. One of the trials was retracted in 2014 because the exactness of the data was unclear. The three clinical trials reported no adverse effects; however, the evaluation noted that two participants in an unrelated non-trial study description dropped out due to adverse events including throbbing and urinary tract infection.
A larger 2017 evaluation assessed the effects of chlorogenic acids, the main phenolic compounds in green coffee extract. It included studies of chlorogenic acids both as a constituent of coffee and directly as a purified extract, and suggested several beneficial effects, in particular improved glucose and lipid metabolism, as well as anti-oxidant and anti-inflammatory activity. The review noted that potential adverse effects of both short and long-term consumption had not yet been investigated thoroughly, and that the number of studies performed on humans has therefore far-off been limited.
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