And if the doc is not too keen on the diet change then look for one that is willing until you find one.
Just watched a movie how at John Hopkins Uni they treat epilepsy with diet and how docs were more willing to do surgery than try the diet. It might be extreme but it often is like that. I mean what does epilepsy have with diet? I would never guess that diet alone can treat most cases.
Doing things the right way is almost always more difficult, often much much more.
It's easier to give the child a pill than change their whole diet pattern for some folks.
Maybe the other 1/3 just wasn't researched in the right way, not given the right food. Maybe it's even that like 99% of kids can be helped with diet alone.
I am a different person when I eat stuff that is good for me...minimal grains, no fake oils, no bread of course unless from nuts....lots of nuts, yolks, veggies, fatty meats, seeds. I keep proportions between the carbs fats and proteins and choose the meats, oils and carbs which are best for me, according to latest research and a Polish doctor whose books I have been reading.
When I go back to eating crap I feel like it definitely. My energy levels go down to 20% of what they were when eating right and life is just so much better and sunnier and more interesting. I can read easier, write easier when I eat well.
Never mind the physical stuff. I've been eating crap. Can't sleep at night, can barely walk on my one leg, have chronic pain faring up, stomach pain.
It all stops when food good for me is introduced.
How odd.
I definitely had ADHD when I was a kid, still do but now can make choices and get treatment for it, the right food. It takes hard work but its well worth it to get the most outta your life. Anyone I think can benefit from a diet change unless they are on top of things. So if you are sick, start with what you eat first. Experiment with different food. If you put crap into a car it won't run but if you keep putting good stuff in it it will work well for a long time. Try to help your food and slowly wean off the meds.