The beautiful thing about this herb? It’s not a stimulant. Research seems to show that garcinia can block an enzyme that converts carbohydrates into body fat. To use garcinia as a weight-loss supplement, eat normally and don’t fill up on high-fiber foods. When scientists have studied garcinia in clinical settings, the HCA supplement reduces weight only if it's simply added to the regular diet. It doesn’t seem to help if it's taken in addition to a high-fiber diet.