Because tyrosine is the basic substance of melanin. In other words, melanin is converted from tyrosine by tyrosinase. If the intake of tyrosine is less, then the basic substances for synthesizing melanin are less, and the skin can turn white. Therefore, we should eat less foods rich in tyrosine, such as potatoes and sweet potatoes.
2. Eat more foods rich in vitamin C.
Chemical experiments have proved that a series of reactions of melanin formation are mostly oxidation reactions, but when vitamin C is added, the formation of melanin can be blocked. Therefore, eat more foods rich in vitamin C, such as Zizyphus jujuba, fresh dates, tomatoes, Rosa roxburghii, oranges, fresh green leafy vegetables and so on.
3. Pay attention to eating foods rich in vitamin E.
Modern scientific research has proved that vitamin E is an antioxidant in human body, especially in fat, which can inhibit the peroxidation of unsaturated fatty acids and other unstable compounds. The lipofuscin in human body is the peroxide of unsaturated fatty acid. Vitamin E can inhibit their peroxidation, thus effectively resisting the deposition of lipofuscin on the skin and keeping the skin fair. At the same time, vitamin E also has anti-aging effect. Foods rich in vitamin E include cabbage, cauliflower, sesame oil, sesame, sunflower seed, rapeseed oil, sunflower seed oil and so on.
Poor qi and blood circulation of the body leads to blackening around the lips.
A circle of blackness around the lips is uneven skin color on the surface, which means that your own qi and blood are not running well enough. Pay more attention to sleep at ordinary times, preferably between eleven o'clock and one o'clock every night, and be sure to enter a deep sleep state. Usually pay more attention to invigorating qi and nourishing blood, eat some Xiangshan medicine, red dates and chicken, and exercise properly to enhance physical fitness.
Poor digestive system leads to blackening around the lips.
Black lips may also be a bad digestive system, so try not to eat all kinds of sweets and fried greasy food. There are also relatively cold food. They can only make your body produce more humid air. Don't worry about lying down or sleeping behind the mountain, which will only lead to food in the body, slow digestion and more moisture. Spleen and stomach deficiency, usually it is necessary to use hot water to soak your feet.
Excessive lip hair leads to blackening around the lips.
The hair on sister paper's lips is very heavy, which is caused by the imbalance between male and female hormones in its body. Taking drugs or foods containing sex hormones will promote the growth of lip hair. If it is this type, it can be balanced by properly supplementing phytoestrogens such as soybean isoflavones.
References:
Causes of pigmentation on the mouth -7 Li Fashion Network