First of all. When eating at noon, drink a glass of water first, and then chew slowly. The slower you eat, the easier it is to get full.
Second. When eating, don't eat, eat.
Cucumber, if you think cucumber is not full, you can eat whole wheat bread first, but you should chew it slowly and never eat it after 8 o'clock.
If you are hungry a few hours after a meal, drink water and boiled water.
Third. Choose a sport. Exercise for 2 hours in the morning and 2 hours in the afternoon. Besides, don't sit after dinner. Get up and walk for about 15 minutes.