Eat a healthier and a more balanced diet. Why not try a home-made smoothie? Just 5 minutes to prepare and make and the best part is, it will be healthy and contain at least 1 of your 5 a day.
Cut the caffeine down. Trust me you will feel good for it. Yes, at first you may suffer from headaches, but try drinking just plain water or water and lime. Not only will you notice that you will feel better in yourself, but your skin will be better too.