Fiber is one of the best foods that can help lose belly fat. High fiber food includes oatmeal, berries, beans and legumes, whole grain and green vegetables. Foods that are rich in monounsaturated fat are also good because it helps control cravings and hunger pangs. Olive oil and avocado are examples of these which can help lose belly fat fast. Look here for more information: http://www.quickandsimple.com/diet-weight-loss/tips-calculator/belly-fat-foods.