Gray nails are not caused by a lack of something, but are mainly a symptom due to a fungal infection. When the organism is deficient in amino acids and vitamins due to malnutrition, it will lead to a decrease in the resistance of the organism, which will make it more prone to gray nails. In the usual diet, pay attention to strengthen the nutrition, eat more protein and vitamin-rich food, such as eggs, beans, dairy, poultry, fresh vegetables and fruits, etc., are conducive to improve the body’s immunity, which will reduce the occurrence of gray nails. Usually also need to pay attention to maintain personal hygiene, avoid and gray nail patients direct or indirect contact, so as to avoid being infected. Once the gray nail situation, need to be under the guidance of the doctor for standard antifungal treatment.