There are many benefits from yoga. Its a very calming, relaxed activity, and can help adjust the brain frequency into a more meditative state instead of the chattering mind syndrome. Yoga will help your circulation, which helps your thinking as well. It is great for stretching the muscles which also helps clean away toxins and improve blood flow, which again helps your brain. Your balance will improve, and if you can get into the yoga groove you can improve your patience and learn to appreciate quiet.
Stick with whole foods, stay away from processed which has a lot of chemicals. Clean water is excellent, too. Eat your veggies as well, they will help your mineral balance, great for de-stressing.