#9 Take your vitamins
You know the old truism in computer programming, "garbage in, garbage out?" The same goes for your body. The first signs of a terrible diet are dull, dry skin and hair. Try eating foods that are rich in vitamins A and D, as well as Omega-3 fatty acids. Carrots, sweet potatoes, avocados, and nuts are just a few of the delicacies that will help your hair stay thick and shiny. Not only will your hair look great, but your skin will look younger and fresher, too. If you can't abide the thought of a healthy diet, a good multi-vitamin taken daily is the next-best thing.