IF YOU HAVE weight to lose, losing it will lower your risk for heart disease. And it doesn’t have to be a lot. Shaving off only 5 percent of total body weight is significant. An analysis of fifty-four studies including more than thirty thousand people with obesity showed that those who completed yearlong diet and exercise-based weight loss programs reduced their risk of death from any cause by 18 percent. Here’s what’s so amazing: the average weight loss was only 71/2 pounds!