Researchers are reporting new evidence that an increase in the amount of belly fat, especially “hidden fat” deep in the gut, is associated with a higher risk of developing heart disease. The study also demonstrated that the density of stomach fat is as important as how much fat you have. In particular, the researchers found that lower density abdominal fat was associated with a higher risk for heart disease. The six-year study included more than 1,000 adults. It was published in the Journal of the American College of Cardiology and funded by the National Heart, Lung, and Blood Institute.