A small fruit that resembles a miniature pumpkin. It is indigenous to India and parts of Asia. The active ingredient in garcinia cambogia, called hydroxycitric acid (HCA), from its fruit and rind is popular in many natural weight loss products. It is used to suppress appetite and enhance fat-burning.
The theory behind garcinia cambogia is that HCA inhibits an enzyme called citrate lyase that helps to turn excess carbohydrates into fat. By inhibiting this enzyme, the body boosts carbohydrate oxidation i.e. it burns up the extra carbohydrates.
In some human double-blind studies using garcinia cambogia or a placebo, the HCA group doubled or tripled their weight loss results over a 12-week period as compared to the control group.