Yes, you must pay attention to a reasonable diet to reduce fat. You can skip dinner, or eat less and eat more things rich in dietary fiber and low in calories. This will be of great help to you in reducing fat. Try to avoid some high-calorie foods at other times except dinner. Do sit-ups, push-ups, suggestions from weak to strong, for example, you can do it now 10, 10 and then do it for 20 days, then do it for 30 days, and so on.