Genes encode proteins and proteins dictate cell function. Therefore, the thousands of genes expressed in a particular cell determine what that cell can do. Moreover, each step in the flow of ...

While factors such as age, genetics, hormones, and medication may affect your hair, nutrition is key for hair health throughout life. In particular, vitamins B, C, and D, plus iron and zinc, play ...

Cynthia Sass is a nutritionist and registered dietitian with master's degrees in both nutrition science and public health. Frequently seen on national TV, she's Health's contributing nutrition editor ...