Maintaining a trim midsection does more than make you look great—it can help you live longer. Larger waistlines are linked to a higher risk of heart disease, diabetes and even cancer. Losing weight, especially belly fat, also improves blood vessel functioning and also improves sleep quality. It’s impossible to target belly fat specifically when you diet. But losing weight overall will help shrink your waistline; more importantly, it will help reduce the dangerous layer of visceral fat, a type of fat within the abdominal cavity that you can’t see but that heightens health risks.