Hair, like your skin and your nail, is often a barometer of general health. If you are healthy, your hair will probably look good. And if your hair is falling, it could be a sign of possible health problems. So everything you do for good health also applies to hair: eat your fruits and vegetables (vitamin b, iron, calcium and zinc have especially been linked to healthy hair); always consume a protein-rich diet (hair is made of proteins), and drink adequate water.