Lemon contains many nutrients, such as sugar, calcium, phosphorus, iron and vitamins B 1, B2, C, etc. In addition, it is rich in citric acid, flavonoids, volatile oil and hesperidin. Citric acid can prevent and eliminate skin pigmentation. Chinese medicine believes that lemon is warm, bitter and nontoxic, and has the functions of quenching thirst, promoting fluid production, relieving summer heat, preventing miscarriage, relieving depression, invigorating stomach and relieving pain, and regulating vascular permeability, and is suitable for mm with edema and puffiness. Smokers should eat more lemons because they need twice as much vitamin C as non-smokers. Lemon has low calorie and strong contractility, which is beneficial to reducing fat and is a good medicine for losing weight. Lemon can prevent cardiovascular arteriosclerosis and reduce blood viscosity. Hot lemon juice and honey are very effective in treating bronchitis and nasopharyngitis.

Brown sugar is warm and sweet, enters the spleen, and has the functions of invigorating qi and blood, strengthening spleen and warming stomach, relieving pain, promoting blood circulation and removing blood stasis. The intake of trace elements and vitamins in the elderly is gradually decreasing, so attention should be paid to supplementing them in the diet to maintain normal metabolic function and delay aging. The two should be used together: detoxification, soothing the liver, moistening the lungs, whitening and moistening the skin.