1. Colloid and trace element chromium in apples can keep blood sugar stable and effectively lower cholesterol; 2. In the air pollution environment, eating more apples can improve the respiratory system and lung function, and protect the lungs from pollution and smoke; 3. Polyphenols and flavonoids contained in apples are natural chemical antioxidants, which can reduce the risk of lung cancer and prevent lead poisoning; 4. The unique fragrance of apple can relieve the bad mood caused by excessive pressure, and also has the effect of refreshing the brain; 5. Apples are rich in crude fiber, which can promote gastrointestinal peristalsis, help the human body to discharge waste smoothly, and reduce the harm of harmful substances to the skin; 6. Apples contain a lot of trace elements such as magnesium, sulfur, iron, copper, iodine, manganese and zinc, which can make the skin greasy, smooth, ruddy and shiny. The general population can eat 1. Patients with chronic gastritis, dyspepsia, qi stagnation, constipation, chronic diarrhea, neurocolitis, hypertension, hyperlipidemia and obesity, cancer patients, anemia and vitamin deficiency are especially suitable. Expectant mothers eating an apple every day can reduce pregnancy reaction; 2. Patients with nephritis and diabetes should not eat more. Dietotherapy: Apple is sweet and sour, cool in nature, and belongs to spleen and lung meridians; Has the effects of promoting fluid production, moistening lung, relieving summer heat, stimulating appetite, sobering up, and relieving diarrhea; Indications: deficiency of qi, dyspepsia, obstruction of qi, mild diarrhea, constipation, vexation with heat and thirst, excessive drinking, hypertension, etc.