Just watched that last night. Don't know what to think of it. I probably should watch it again because at the end it didn't seem as important as the title suggested. Maybe I just didn't get it all.

Seems like to get clicks the Youtube titles just keep getting more and more outrageous. 

Watched another one that said B12 was important for nerve health. As we age it does not get absorbed as well (seems like a lot of things work that way as we get old, including intelligence). And particularly so if diabetic, which of course I have been for more than 35 years.