This plant offers one of the least expensive herbal supplements on the market. The ingredient from the rind of the fruit could hasten your weight-loss efforts. The natural extract is called hydroxycitric acid (HCA), and researchers claim that HCA can double or triple one's weight loss. HCA blocks fat by inhibiting a key enzyme that your body needs to make fat from carbohydrates: Citrate lyase. Usually carbohydrates or sugars that are not used immediately or stored in other forms are converted into fats. When HCA inhibits citrate lyase, the fat-making process is halted and the production of LDL (bad cholesterol) and triglycerides decrease.