This whole episode makes me suspicious about how high quality this experiment was. First, they would have had to at least inform people of what the study was about (testing green coffee bean extract for it's effectiveness on weight loss). It's a basic rule for any kind of research to inform the participant. Second, how did they pick the people? Were these people that already had tickets to the show and they were offered through the mail? Did these people volunteer? If they were volunteering because of an advertisement for weight loss, we now need to consider the fact these individuals may have already been dieting prior to taking the supplement.
Always be cautious when viewing products like these on television. They can get sensationalized at times.
I have looked over the research myself and here is what I can tell you about green coffee bean:
1) Short term studies have shown that taking a water-soluble green coffee extract can significantly reduce blood pressure in people with mild hypertension (about 5-6mmHg).
2) There is some evidence in short term trials that green coffee bean extract may produce MILD weight loss (about 2.5kg or 5lbs) in about 6 weeks. These are preliminary studies though, short in duration and poor in quality.
To date there is no danger in taking this product for a short duration but there is no longer term studies on its possible side effects so be careful.
It's the chlorogenic acid in a green coffee bean that appears to be responsible for the weight loss that we are seeing. It effects how sugars are broken down in the body and even how fat is deposited. Most research on how it works has been done on animal studies to date.
So this is why you are hearing all the GREEN COFFEE BEAN advertisements on the radio and TV now. They must be working towards developing more human studies.
If you are looking for something to help your weight loss along, this may help a bit, but the current research would tell me that you won't be seeing anything terribly dramatic.
Even if it helps, we still need to look at the quality of our lifestyle (diet, exercise and stress) as well in order to reach our optimal level of health.