1, whitening and beautifying. Green kumquat and green lemon are rich in vitamins, which can prevent and eliminate skin pigmentation, have whitening effect and are natural beauty products. But they are all light-sensitive foods. If you want to have whitening effect, you need to avoid light. 2, appetizing and digestion. Although kumquat and lemon are sour, they can't be eaten raw or fresh like other fruits, but the peel is rich in aromatic volatile components, which can quench thirst, relieve summer heat, stimulate appetite and promote digestion. When you are tired after working or studying for a long time and often have a poor appetite, drink a glass of lemon soaked in water, which makes people feel refreshed. 3, antibacterial and anti-inflammatory. Lemon is rich in vitamin C, which acts like a natural antibiotic on human body. Has antibacterial, antiinflammatory, and immunity enhancing functions. You can drink more hot lemonade to maintain your health. 4. Prevent civilized diseases. Prevent colds, stimulate hematopoiesis and fight cancer. It can not only prevent cancer and food poisoning, but also reduce cholesterol, eliminate fatigue, enhance immunity, strengthen stomach, eliminate phlegm and relieve cough, and prevent asthma and bronchitis.