Green coffee has recently caused a sensation as a means of treating obesity.
Can we trust these reports? Or is it just one of the many "take-off modes"? How can the effect be explained? And what effects does GrÃ? nner Kaffee actually have? These questions are to be answered here, according to the current state of medical knowledge. I will also talk about possible side effects.
Being overweight is not only a question of appearance, it is one of the biggest health problems in the world. 1.5 billion adults worldwide were overweight in 2008, compared with an estimated 2.3 billion in 2015, according to WHO estimates. Approximately one third of it must be designated strongly overweight.
Even though the causes are many and varied, our lifestyle and the oversupply of high-calorie foods do not make it easy for us to stay slim. Among the many known consequences of obesity are: arteriosclerosis and, as a result, cardiovascular diseases or diabetes with serious complications.
No matter what causes and consequences the overweight of an individual patient might have, one thing should be the same for everyone: Everyone would be happy to find a simple and safe way to lose weight and prevent the consequences such as some diabetes and arteriosclerosis. This explains the success of green coffee. But can this promise really stand up to scientific scrutiny?
The weight-reducing effect of the drug became known through a study at Scranton University in Pennsylvania, USA.
Study by the University of Scranton on weight loss with Green Coffee Extract
This study was presented at a meeting of the American Chemical Society, the largest scientific association in the world, in San Diego in March 2012 and caused a sensation at the conference.
San Diego Meeting of American Chemical Society: New evidence on effects of green coffee beans in weight loss
The study of American and Indian researchers is the beginning of the worldwide attention that GrÃ? ner Coffee receives. For the study, 16 overweight individuals took green coffee extract or a placebo for 22 weeks. Otherwise the participants did not change their eating habits. They consumed the same number of calories (2400 calories per day on average). Neither did they change their sporting activities.
The result is surprising: 16 overweight people each took high and low amounts of green coffee extract and a placebo for six weeks, eating habits and exercise habits were always the same. At high doses, the test persons lost an average weight of 2.04 kg, at lower doses 1.54 kg, and at placebo, they gained 0.32 kg. Over the 22 week observation period, participants lost 17 pounds of American pounds (7.7 kg). This again corresponded on average to a decrease in body weight of 10.5 % and a decrease in body fat content of 16 %.
That's impressive. This study is also particularly important as it is a randomized, placebo-controlled double-blind study. But the small number of participants is also pointed out time and again.
The sensational study by the University of Scranton is supported by a Norwegian study from 2007, which has recently become less well known. However, it largely confirms the results of the American study:
The Effect of Chlorogenic Acid Enriched Coffee on Glucose Absorption in Healthy Volunteers and Its Effect on Body Mass When Used Long-term in Overweight and Obese People
The effect of weight loss on chlorogenic acid is reduced here and in other studies. It is found in green coffee and especially in green coffee extract.
Experiments with mice have been pointing to the weight-reducing effect for some time now. Â http://www.biomedcentral.com/1472-6882/6/9Â (study from BMC in 2006) andÂ http://www.sciencedirect.com/science/article/pii/S027869151000013XÂ (study in 2010).
Now there is also a comparative study from 2011, which allegedly proves that these results and the effect of chlorogenic acid are unsafe. Â http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2943088/
In this study more than 2000 studies on the topic were sighted, three relevant studies were selected and compared. The comparative study states that the results differ and that no reliable statements can be made for long periods of time.
That is correct, but overlooks the fact that all three studies showed clear reductions in weight. And since they were not designed as long-term studies, they could not and did not want to make statements about long Z