Are There Alternative Ways To Manage ADHD, Emotional Outbursts And Lack Of Focus When The Teenager Fusses About Taking Medication?

I am looking for more specific information to help my 15 year old son who suffers from ADHD, but refuses to take his medication. Is there alternative methods or specific foods I can give him to help him cope with emotional outbursts, lack of focus in school, and inattention in general?