@Agnieszka I hope you don't feel like I'm attacking you for posting this. I understand the curiosity and passion you have about this topic. I think posting and trying to engage in a healthy dialogue about this is healthy and commendable. So props. On a side note, I'm going to my grandma's funeral on the 20th. She died of dementia. It's scary and now that I have this family history too, it's yet another disease that might do me in as well. My only response is that, I'm going to die from something. I might as well die from living. That doesn't mean eat like shit and sit on your ass all day.

I didn't watch all of the video. I couldn't. Dude screams creep, and the video sound more like a sales pitch than science. It's all shits and giggles about Chris' rocks "Would you like some dick," vid, but when it comes to taking advantage of desperation, to put it kindly, fuck him. As a healthcare practitioner, there are some serious boundaries that he has crossed.

My ex is a neuroscientist who's done a lot of work with people with degenerative brain illnesses.
It boils down to this: we don't know what initiates the amyloid plaques and associated damage common in Alzheimer's, Semantic Dementia and other progressive brain illnesses. What we can influence is the trajectory they follow.
If you're healthy and mentally and physically active, symptoms will be delayed and your decline will be fast. Neuroplasticity will protect you from the worst effects of your brain damage until the neural pathways become fundamentally destroyed. Death usually follows within 6-12 months.
If you're unhealthy, sedentary and inactive, symptoms will appear early, and you may spend 5-10 years dieing by inches.

He's got true believer syndrome and goes too far but he's less quack than showman. A lot of what he says makes sense, basic heathy living, nutrition, exercise and avoiding injury probably is a reasonable approach to brain health.

Study after study has shown nothing helps Alzheimers ,it is a progressive growth of plaques on the brain.....not fixable by head games, exercise, or any known supplements/diets. And, I personally had a brain-stem stroke at age 38 (turned 39 in the hospital) so when I sometimes have "senior moments" no doctor is going to be able to tell me my problems are to the stroke "the gift that keeps on giving" or incipient Alzheimers.
As a long-time Type II diabetic, (since 1992) his sugar condemnation is a good idea for anyone, but Nothing to do with brain problems unless your blood sugar has gone momentarily wacky (either too high or too low).
As long-term president of a social club for Seniors, I have seen several members who exercised heavily (daily 3 mile + walks plus Zumba classes, etc) and Alz. got them. Blaming the victims, is he?

He's a quack selling snake oil, I wouldn't put any faith in it.