The nails are usually deficient in vitamins and trace elements, mainly protein, calcium, iron, zinc, vitamin A and B. The nails need a lot of nutrients to grow and become smooth and hard. It is important to pay attention to the balance of nutrition, do not be picky, eat more high-protein foods, such as eggs, milk, lean meat, walnuts, ribs. Eat more foods with calcium, iron and zinc, such as shrimp, black sesame, oysters, yogurt and peanuts. Foods containing vitamins A and B, such as carrots, animal liver, dark green vegetables, oats, brown rice, pumpkin. Usually, you should get into the habit of going to bed early and getting up early, don’t stay up late for a long time, you will recover soon. It is recommended to go to the hospital dermatology department for examination to rule out grey nails.