I suggest you eat some staple food in the morning, such as a bowl of oatmeal and a boiled egg. It can also be a steamed bread with miscellaneous grains, a boiled egg, a cup of soybean milk and a little fruit.
It is recommended to eat normally at noon, but not too much. A bowl of rice with some meat and vegetables can basically meet the energy in the afternoon.
Eat less at night. It is recommended to eat some vegetables. You can drink some yogurt when you are hungry.
Stick to this for a week and you will see the effect. Focus on persistence, come on!