The specific extract being used in Garcinia Cambogia dietary supplement is called Hydroxycitric Acid (HCA) and it works in two ways to promote weight loss:
First, it suppresses your appetite by increasing serotonin levels. Low levels of serotonin are linked to depression and anxiety, which drive many people to eat emotionally. Thus, as your serotonin levels rise, your mood improves and lessens the drive to reach for food during emotional situations.
Second, Hydroxycitric Acid prevents the build-up of fat in the body and slows down the emptying of your stomach. It inhibits the enzyme citrate lyase in the body which helps in the process of synthesizing of fat from carbohydrates.