Beckerman recommends people eat more soluble fibre to burn more belly fat. Soluble fibre dissolves in water and creates a gel-like substance that mixes with other partially digested food in your small intestine. "This gel that forms slows digestion in the body, which keeps you feeling full for longer," she told POPSUGAR. "Research supports that soluble fibre leads to a decrease in the amount of fat in the abdominal region." Focus on eating foods like lentils and other legumes, barley, and some fruits and veggies such as cauliflower, apples, and citrus fruits.