While cosmetic companies would like to convince you that their particular chemical compositions of skin-boosting ingredients form a fountain of youth to ward off wrinkles, help your nails grow, and keep your hair thick and full, that’s not always the case. The truth is, the best way to improve your outward appearance is to take care of the inside of your body. Great health starts from within, and a nutrient-rich diet can mean the difference between dry skin, brittle nails and limp hair, and glowing skin, shiny nails, and vibrant locks.