Also another way perception works is through failed expectations. If a parent has an expectation about their child that the child doesn't fulfill, it's normal human behavior to view that failure as much worse than it really is. With the sugar, the parent is playing into the perception that sugar makes children hyper, but it must work in reverse, as well, as it does elsewhere in our lives.
I expect to get that job I've been after, and I don't get it, my life is ruined. I hope to get tickets to a concert and I don't get them, fuck my life. I want to spend my entire life with my girlfriend and she dumps me, time to die.
That's how skewed our culture of ADHD is. Hyerpactivity, imo, is not a disease or a disorder, it's the normal function of most children as they explore, create, experiment with, and learn about their environment. Kids get themselves into trouble, they're loud, they can be annoying with their 10,000 questions, and when they don't get enough positive attention they will seek attention in negative ways. (Some kids do have learning disabilities, and are ADD, but I bet far fewer than are diagnosed each year).
The irony is maxed out. Parents who ignore their kids tend to have the most ill-behaved children, making it impossible to ignore them. Parents who expect their kids to be good all the time often either totally ignore their faults or exaggerate those faults and end up putting them on meds.
It's Chapter 2 of the Tao Te Ching applied to reality.