Eating a balanced diet can prevent hair loss
Your diet doesn't just affect your body -- it also influences the health of your hair. Eat a balanced diet with plenty of fruits and vegetables, lean meat (or other protein sources such as eggs or tofu) and whole grains. Avoid processed food as much as possible. Pay attention to your vitamins and minerals. B vitamins, folic acid and biotin are all important for healthy hair and skin. Vitamin C also can aid in improving scalp circulation. Zinc can stimulate hair growth because it enhances immune function, while the amino acids L-cysteine and L-methionine can improve the quality and texture of your hair.
On the other hand, large doses of vitamin A (100,000 IU or more daily) over a long period of time can actually cause hair loss. Therefore, don't overdo it with vitamin A.