subject: How Does fat Burnining Green Coffee Work? [print this page] Leptin has extracted all the "good stuff" from unroasted fresh green coffee beans, namely Chlorogenic Acid which is very prevalent in them. Once a coffee bean is roasted, the chlorogenic acid is greatly diminished. That is why regular roasted and brewed coffee does not have the effects that Leptin's green coffee 800 has on ones body.Chlorogenic Acid reduces the absorption of carbohydrates that are stored as fat. Clinical studies have suggested that chlorogenic acid used as part of a healthy diet helps maintain normal blood sugar levels. Chlorogenic Acid also preserves natural antioxidants in the body and decreases the production of free radicals.