Dr. David Perlmutter should be ashamed for contributing to the trend of lumping ADHD in with huge lists of symptoms such as (quote): "dementia, decreased libido, depression, chronic headaches, anxiety, epilepsy, and ADHD"

ADD and ADHD may not be as crippling as some mental conditions, but there is real peer-reviewed medical research out there concerning diagnosis and treatment. Hint: counseling and doctor-prescribed medication is more effective than homeopathy and trivial diet changes. People just want an easy solution and someone to blame.

What is the TLDR please?

Carbs rot your brain, so you should avoid grains and eat like a caveman. Or maybe not? One thing is for sure, people like reading about diets more than they like sticking to them. Meantime, you can subscribe for only $$ a year.

Where would you find a control group for this kind of study? People who never tasted anything made from wheat?

Small indigenous groups like the Inuit maybe? but then you've got a bunch of other factors to screen out. I presume Perlmutter's hostility to grains includes rice and other high-carb grains, which rules out Japan and other Asian countries where wheat is less popular.