Green coffee beans are coffee beans that have not yet been roasted. The roasting process of coffee beans reduces amounts of the chemical chlorogenic acid. Therefore, green coffee beans have a higher level of chlorogenic acid compared to regular, roasted coffee beans. Green coffee became popular for weight management after it was mentioned on the Dr. Oz show in 2012. These coffee beans contain a higher amount of the chlorogenic acid. This chemical is thought to have health benefits and in weight management.