Hi DMW,
Great to see you around.
Hmmm, better with the link...
http://www.vegsource.com/news/2012/12/neal-barnard-md----go-vegan-to-avoid-alzheimers-video.html I agree with you that blockages at the capillary level likley powerfully contribute to Alzheimers. However, as dimentia is categorized, ischemic dimentia is due to blockages, and Alzheimers, which is one type of dimentia, is characterized by tangles and amyloid plaque. Microscopically inspecting brain tissue, you can have ischemic without Alzheimers and visa versa. But again, I agree with you that I also suspect that poor circulation contributes to Alzheimers. All the risk factors for Alzheimers are exactly identically the same as for heart disease.
There is a gene, the APOE E4 gene, which greatly increases the risk of alzheimers. (I just sent away for a "spit kit" from 23andMe, for $99, which will tell me if I have this gene, as well as 200 other genes of interest.) Anyway, checking this gene in Wikipedia, shows that this gene also raises risk of heart disease also. This is yet another example of anything done for heart health, also likley improves brain health, and whole body friendly, as you point out. And clearly, I need all the help I can get in the brain area. ^o^
One theory of Alzheimers is that brain cell mitochondria can get damaged, and release toxins. These toxins collect over years, and help promote Alzheimers. I also read in Scientific American (1) that autophagy can prompt cells to clean up and remove damaged mitochondria. This is cool. Autophagy would occur during fasting, certainly, and perhaps when getting hungry between meals (eating 2 or 3 meals a day).
Best regards, EngineerGuy
(1) Scientific American, Jan 2012, "A New Path to Longevity"