My son was diagnosed with ADHD at 7. We immediately put him on a gluten, dairy and soy free diet and limited sugar, preservatives, colouring and added supplements. Yes its bloody hard and expensive. He has steak and eggs for breakfast! We were told it takes up to 2 years to fix his gut (he had two bouts of antibiotics in hospital as a newborn and 2 year old) and we're just starting to see the results now after about a year. He's concentrating, pleasant to be around and having few breakdowns.