Hair gets its structure from keratin, which is essentially hardened protein. So getting enough protein in your diet is vital to hair health. Lentils happen to also be iron-rich, which is great news for vegetarians who often struggle to find non-meat sources of both protein and iron. For an unusual and delicious way to incorporate lentils, whip up some chipotle lentil tacos with fresh guacamole. To prepare, cook the lentils with vegetable broth, lime juice and chipotle peppers in a saucepan. Serve on soft tacos with a spoonful of spicy guacamole.