South Florida's latest weight-loss craze and the booming business it's spawned are based on a pricey hormone that many doctors say is useless as a diet aid and may carry serious health risks. The U.S. government has refused for decades to approve the substance known as HCG for weight loss, and two states ban its prescription for that purpose. But a Sun Sentinel investigation found South Florida clinics charging hundreds of dollars for diet plans that employ the hormone produced by pregnant women, and facing virtually no regulation, inspection or oversight. In its probe of 50 Florida clinics and HCG providers, more than two dozen of which are in Broward, Palm Beach and Miami-Dade counties, the Sun Sentinel found: • Physicians and counselors say HCG will help patients obtain dramatic weight-loss results without side effects, hunger pangs or the need for exercise, claims that the U.S. Food and Drug Administration and a significant body of medical research disput...