Insulin resistance contributes to neurological conditions such as Alzheimer's -
http://www.sciencedaily.com/releases/2012/03/120323134908.htm
"Our research clearly shows that the brain's ability to respond to insulin, which is important for normal brain function, is going offline at some point. Insulin in the brain not only modulates glucose uptake, but also promotes the health of brain cells -- their growth, survival, remodeling, and normal functioning. We believe that brain insulin resistance may be an important contributor to the cognitive decline associated with Alzheimer's disease," said senior author, Steven E. Arnold, MD, professor of Psychiatry and Neurology. Arnold is also the director of the Penn Memory Center, a National Institute on Aging-designated Alzheimer's Disease Core Center. "If we can prevent brain insulin resistance from occurring, or re-sensitize brain cells to insulin with any of the currently available insulin-sensitizing diabetes medicines, we may be able to slow down, prevent, or perhaps even improve cognitive decline.
The risk of developing Alzheimer's disease is increased by 50 percent in people with diabetes. Type 2 diabetes is due to insulin resistance and accounts for 90 percent of all diabetes."
...and in another study from last year -
http://www.neurology.org/content/75/9/764
"People with insulin resistance and type 2 diabetes appear to be at an increased risk of developing plaques in the brain that are associated with Alzheimer's disease, according to new research published in the August 25, 2010, issue of Neurology®, the medical journal of the American Academy of Neurology"
The protease class of enzymes as produced by Candida albicans has been found to create Diabetes, Hypertension, and ImmunenSystem suppression -
http://www.jacobsschool.ucsd.edu/news/news_releases/release.sfe?id=744
Via this mechanism, Candida can be seen to contributing to the increase in neurological conditions, such as Alzheimer's, via its production of Secreted Aspartyl Protease.