Weight-management supplements and functional foods have grown in sophistication. For example, Natrol Inc., Chatsworth, Calif. (phone 818-739-6000, www.natrol.com, www.slenderite.com), offers Slenderite™, a dietary supplement that combines fi ve ingredients to promote weight loss: a starch neutralizer to delay digestion and absorption of carbohydrates; epigallocatechin gallate (EGCG) to promote fat oxidation; caffeine; chromium picolinate to help metabolize carbohydrates, fats, and protein; and 5…