The benefit of eating lemon is that it can supplement vitamin C and other nutrients. Lemon is rich in vitamin C and rich in vitamin E. Every 100g of lemon contains about 22mg of vitamin C and 1.14mg of vitamin E. The intake of vitamin C can maintain the elasticity of the skin and blood vessels, and it can promote the gastrointestinal tract to the absorption of iron. In addition, every 100 grams of lemon contains 35 calories, of which 6.2 grams of carbohydrates, 1.3 grams of dietary fiber, 1.1 grams of protein, 1.2 grams of fat, 101 milligrams of calcium and 0.8 grams of iron. People with gastric or duodenal ulcers are not advised to eat lemons on an empty stomach, as it may enhance the acidic environment in the stomach, which is not conducive to ulcer healing.