You can't. If you want to lose fat successfully, the key lies in controlling diet, reducing calorie intake, choosing low-fat and low-calorie foods and exercising moderately. Although McDonald's offers some low-calorie food choices, such as salads, fruits and sandwiches, not all foods are good choices. Classic fast food, such as French fries and cheeseburgers, are high in calories, fat, salt and sodium, which are harmful to health. Therefore, we should pay attention to food hygiene, fully control food intake, and try to choose low-calorie and low-fat foods.