My brain has sufficient glucose otherwise I literally couldn't function and there would be other problems caused by the cell's inability to access the large amount of glucose.
In fact, we have a term of that exact disease — diabetes. You're talking about a book that misdescribes diabetes as ADHD, and then purports to cure ADHD with diabetes cures!
Yeah. If someone repeatedly refers you to external resources instead of explaining a process clearly in their own words, it's a sign that they don't know what they're talking about or are deliberately full of shit. I'm charitably categorizing OP in the first bucket, but their approach is still aggressively ignorant to the point of harm.
In fact, we have a term of that exact disease — diabetes. You're talking about a book that misdescribes diabetes as ADHD, and then purports to cure ADHD with diabetes cures!