Eating apples on an empty stomach can increase the burden on the stomach, and it is recommended to eat apples after meals. Apples have the effect of strengthening the stomach and moistening the lungs, and they are rich in dietary fiber, vitamin B1, vitamin E and other trace elements, which are more suitable for patients with chronic gastritis, indigestion and vitamin deficiency. According to modern clinical research, the crude fiber in apples can promote gastrointestinal peristalsis and help the body to smoothly discharge waste to reduce the harm of harmful substances, and a large amount of trace elements and vitamin C can help eliminate skin freckles and dark spots. The gum and trace elements in apples can keep blood sugar stable and effectively lower cholesterol. Eating more apples can also improve respiratory and lung function and protect the lungs from pollution and smoke, but it is not easy for patients with ulcerative colitis and cold stomach to eat apples raw.