That depends on your constitution. First of all, control weight and reduce the intake of carbohydrates, such as potatoes, sweet potatoes, cakes, rice, pasta and so on. Try not to eat. If you are weak, you can eat some whole wheat food for breakfast, such as sago's sugar-free cereal. Eat more vegetables, bananas and grapes, and eat less sugar. Don't eat lunch at four o'clock in the afternoon after dinner. It usually takes a week to work. If you are hungry, eat an apple at night.