This is a small study with a PC slam at red meat. However the article contains some useful information for those at high risk of Alzheimer's.

Cholesterol linked to brain changes that cause Alzheimer's disease
Reducing the amount of bad cholesterol and increasing good cholesterol you eat may help to reduce the risk of Alzheimer's disease, a new study suggests

By Richard Gray, Science correspondent
9:01PM GMT 30 Dec 2013

High levels of unhealthy cholesterol may contribute towards one of the key signs of Alzheimer’s disease developing in the brain.

Researchers have found patients with high levels of “bad” cholesterol in their blood tended to have more harmful tangles of protein inside their brain cells.

These tangles, known as beta amyloid plaques, are one of the main physical signs of Alzheimer’s disease and are thought to interfere with the way brain cells work.

The findings add to the growing evidence that suggests poor diet and cholesterol may play a role in the development of Alzheimer’s disease.

The exact causes are still to be understood, but the latest study showed that high levels of low density lipoprotein, or bad cholesterol – which is typically found in red meat – led to more tangles in the brain.
. . . .
The latest study looked at 74 men and women who were more than 70 years old and examined their blood cholesterol levels.

Their brains were also scanned using tracer chemicals that bind to amyloid plaques to examine.

Three of those taking part suffered from mild dementia, 38 had mild cognitive impairment and 33 had no memory problems at all.

http://www.telegraph.co.uk/health/health...l#disqus_thread