Vascular Dementia Caused by Plaque Build-Up in Arteries

You can compare this Mayo clinic explanation of atherosclerosis to an earlier one I pointed to.
Vascular dementia and artery plaque by Mayo Clinic
You can see a video of how plaque forms here:
Inflammation In Atherosclerotic Plaque Formation 
You can see from both of these that the real solution is to stop the original inflammation in the first place. Reducing cholesterol is a secondary solution and a poor one at that.