The beans (or seeds) found in the berries of coffee trees contain high levels of chlorogenic acid. Chlorogenic acid works in two ways. First, it reduces the absorption of blood sugar (glucose) by the intestine. Then it inhibits an enzyme in the liver so that less glucose is released into the bloodstream. With less glucose available, the body burns more fat stored in adipose tissues as a source of energy rather than glucose. Clinical studies showed those taking green coffee extract for 60 days experienced 5.7% weight loss and 4% lean mass to fat mass ratio increase.