HEALTHY HABITS

(CBS News) - Could the secret to weight loss be found in coffee? According to a new study, people who took a daily dose of green coffee - which is unroasted coffee beans - lost about 10 percent of their body weight.

The study, which gave participants a supplement containing green coffee extract, was presented at the American Chemical Society (ACS) in San Diego and published earlier this year in Diabetes Metabolic Syndrome and Obesity.

PICTURES: Coffee and your health

The new study involved 16 overweight people (with Body Mass Indexes between 25 to 30) between the ages of 22 to 46 years old. They were monitored for 22 weeks, in which they were given a low dose 700 mg green coffee extract tablet, a high dose 1,050 mg extract tablet and a placebo. Because they were given all the different doses and the inactive placebo, the participants acted as their own control group.

Participants were told to take three green coffee capsules each day, 30 minutes before each meal with lots of water, due to the pill's bitterness. Roasting coffee makes beans less bitter, according to the researchers. The pill contained caffeine, but it amounted to about half a cup of coffee a day.

All the participants were monitored for their overall diet and exercise. Throughout the study, participants ate on average 2,400 calories a day and had a calorie expenditure of 400 calories, nowhere near the levels required for weight loss.

What effects did green coffee have?

After the study, participants lost an average of 17 pounds, which broke down to a 10.5 percent decrease in overall body weight and a 16 percent decrease in body fat. Lead researcher Dr. Joe Vinson, a professor of chemistry at the University of Scranton in Pa., said in an emailed press release that the weight loss may have been more, but since the subjects received a lower dose and placebo at some point in the study it may have lessened the overall effect. The study was funded by Applied Food Sciences, which makes green coffee supplements.