Green Coffee Bean Extract: Does it work? Is it safe?

Over the years we have seen dozens of ‘miracle’ weight loss supplements come and go, including bitter orange, chromium picolinate, CLA, hoodia, yerba mate, raspberry ketones, and now green coffee bean extract. Each has been touted as an effortless way to shed pounds, by either boosting metabolism, mobilizing body fat or suppressing appetite.

You may have seen green coffee extract at Starbucks, promoted as a natural energy source with no coffee flavour. It was also featured recently on The Dr. Oz Show. On his program, the doc revealed the results of his own investigation, which involved recruiting 100 women who either received a placebo or a 400 mg green coffee bean supplement.

The ladies were instructed to make no changes to their diets and after two weeks, those who had taken the green coffee bean extract lost an average of two pounds, compared to one pound for the placebo group.

So, what exactly is green coffee bean extract? Does it really work? And is it safe. Green coffee beans are actually the green seeds inside the bright red berry. Roasting them turns the seeds brown and creates the characteristic aroma and flavour that coffee gives. To create green coffee bean extract, the seeds are left unroasted. Instead they’re soaked and then concentrated to create the extract.

When coffee seeds or beans are roasted, their antioxidant levels increase, however one natural substance called chlorogenic acid decreases. This chemical is thought to block fat accumulation, boost weight loss, curb carb absorption, and help regulate post meal blood sugar levels.

In a study done at the University of Scranton in January 2012, they carried out a double blind, placebo controlled, cross over study of 16 overweight adults, between the ages of 22 and 46 that were given varying doses of Pure Green Coffee Bean Extract (700mg and 1050mg) and matching placebos over a 22 week duration. Subjects were not asked to change their diet or exercise patterns.
At the end of the 22 week study, subjects who took the Green Coffee Bean Extract lost an average of 17 pounds, which is roughly 10.5 % of their body weight and 16 % of their body fat. Of particular interest was the fact that both the low dose green coffee bean extract and high dose green coffee bean extract groups lost weight.

As to whether green coffee bean extract works, the jury still appears to be out. The study was criticized because it involved such a small number of subjects only 16 and it was funded by a green coffee bean extract manufacturer. An independent analysis of three randomized clinical trials that included a total of 142 participants concluded that the effect of green coffee extract is only moderate at best, and the studies were poorly conducted.

As regards the study carried out by Dr. Oz, the women lost 1 extra pound over those who took the placebo over a two week period, which is interesting but maybe not enough to warrant taking the pills.

The other factor to consider is how safe are they. Unfortunately there is no standardization when it comes to these supplements. In other words, manufacturers don’t have to follow a specific formula, so one green coffee extract product could be made completely differently than another. And one brand could contain significantly more caffeine than the bottle next to it. That is a concern because concentrated doses of caffeine can cause headaches, GI upset, nervousness, insomnia, anxiety, ringing in the ears, and irregular heart beat, or even more serious problems in some people.

In addition, using caffeine based weight loss supplements and then stopping them has also been associated with withdrawal symptoms including headache, fatigue, depression, trouble concentrating, nervousness, muscle tension, and a flushed face. Caffeine based supplements can also react with other prescription medications such as diabetes, blood pressure and anti-depression drugs.

Clearly, despite some positive results, the jury is still out on green coffee bean extract. However there are weight loss aids available such as the prescription only Xenical and the newly released XLS-Medical, both of which are clinically proven to aid weight loss in conjunction with a reduced fat diet and exercise.