Superstar Janet Jackson has endured a very public battle with her fluctuating body weight over the years, but the singer recently debuted a svelte new figure with the launch of her partnership with Nutrisystem.Jackson described herself as an "emotional eater" to Prevention earlier this year, telling the magazine that her body image was not the only reason she decided to get serious and lose the excess lbs. "Health was always a concern," she said. "When I gained weight in 2005, my nutritionist was very worried. I was close to having diabetes. Even when I lost it [and] then gained quite a bit back, there was always the thought of heart disease."