28 March 2012

Scientists Present Proof Green Coffee Beans Help in Fast Effective Weight Loss

Scientists report a study that presents new evidence that green coffee beans (unroasted coffee beans) can help in weight loss.

Green coffee beans refers to coffee beans that have not been roasted.

A coffee plant usually starts to produce flowers 3–4 years after it has been planted. The fruits of the plant or coffee cherries appear from these flowers, with the first useful harvest possible around 5 years after planting. The cherries ripen around eight months after the emergence of the flower, by changing colour from green to red. It is when the cherries turn red that they are harvested.

The difference between green coffee beans and roasted ones is chlorogenic acid.

Chlorogenic acid is stable and normal at room temperature but becomes unstable at high temperatures. Roasting coffee beans leads to decomposition of chlorogenic acid and forms brown aromatic Maillard reactants. These reactants give roasted coffee its characteristic flavor and aroma. Green coffee, by contrast, has no aroma and tastes slightly bitter.

Green Coffee Beans Promotes Weight Loss

Scientists have reported striking new evidence that green, or unroasted, coffee beans can produce a substantial decrease in body weight in a relatively short period of time.

In a study presented at the 243rd National Meeting & Exposition of the American Chemical Society (ACS), the world's largest scientific society, Joe Vinson, Ph.D., and colleagues described how a group of overweight or obese people who consumed a fraction of an ounce of ground green coffee beans each day lost about 10 percent of their body weight.

"Based on our results, taking multiple capsules of green coffee extract a day — while eating a low-fat, healthful diet and exercising regularly — appears to be a safe, effective, inexpensive way to lose weight," Vinson said at the ACS meeting, being held here this week. He is with the University of Scranton in Pennsylvania.

Video: Green Coffee Beans

The study involved 16 overweight or obese people aged 22-26 years who took capsules of the extract or capsules containing a placebo, an inactive powder, for a total of 22 weeks. The subjects alternated between a low dose and a higher dose of the extract. The low dose consisted of 700 mg of the coffee extract, and the high dose was 1,050 mg. It was a so-called "cross-over" study in which people cycled through the two doses and the placebo, each for six weeks. Such studies have advantages because each person serves as his or her own "control," improving the chances of getting an accurate result.

All of the participants were monitored for their overall diet (calories, food eaten, etc.) and exercise over the study period. "Their calories, carbohydrates, fats and protein intake did not change during the study, nor did their exercise regimen change," Vinson said.

Participants lost an average of 17 pounds during the 22 weeks of the study. It included an average of a 10.5 percent decrease in overall body weight and a 16 percent decrease in body fat. Vinson noted that weight loss might have been significantly faster, except that participants received the placebo and the lower dose of green coffee extract for part of the study period.

Vinson pointed out that previous studies have shown weight loss with green coffee. But this was the first to use higher amounts of the coffee extract and the first to measure the response to various doses. Based on those studies, Vinson believes that green coffee beans' effects likely are due to a substance called chlorogenic acid that is present in unroasted coffee beans. Chlorogenic acid breaks down when coffee beans are roasted (usually at a temperature of 464-482 degrees Fahrenheit). Roasting gives coffee beans their distinctive color, aroma and flavor. Green coffee beans, in contrast, have little aroma and a slightly bitter taste.


American Chemical Society
243rd National Meeting & Exposition
University of Scranton
Coffee processing
Decaffeinated Coffee Improves Brain Metabolism in Patients with Type 2 Diabetes
Exercise Alters DNA of Muscle for Strength
Anti-Diabetic Medicine Beneficial in Prevention of Long Term Maternal Obesity
Poor Eating Habits At Work May Lead to Obesity, Diabetes and Other Disease
Obese Dogs Find Better Quality of Life After Weight Loss
Long Term Diabetes Increases Risk of Stroke
Aspirin Lowers Risk in Trans Fat Related Strokes
Brown Rice Have High Levels of Arsenic
Milk and It's Effect on Brain Development and Performance