Foods that promote appetite mainly affect gastrointestinal hormones and gastrointestinal motility, including acidic pH in the stomach. Patients are often advised to take a small amount of yogurt, which at room temperature can improve gastrointestinal peristalsis, regulate intestinal flora and increase the gastrointestinal demand for appetite. Orange juice, which is rich in vitamin C, can improve the body’s resistance and immunity and stimulate the body’s vitality, which can improve the pH level in the stomach and stimulate the appetite. You can also consume fruits and vegetables, such as tomatoes rich in a large number of vitamin B, which is an essential vitamin for the human body. Eating a large number of tomatoes rich in vitamin B can also improve the gastrointestinal environment, increase appetite, help the gastrointestinal tract peristalsis, better absorption and digestion of the ingested protein, these three foods are recommended to be used when the appetite is low.