David Perlmutter — American Scientist

David Perlmutter is a Naples, Florida based American physician, author, and scholar. He is the president of the Perlmutter Health Center. Perlmutter is the author of health books and is known for advocating a functional and holistic approach toward treating brain disorders. Perlmutter is also a frequent contributor to publications such as the Huffington Post,The Daily Beast, and Mind Body Green. Perlmutter's book has received criticism for perceived "hyperbole" and misrepresentation of data... (wikipedia)

Increase your consumption of healthful fats like extra virgin olive oil, avocado, grass-fed beef, wild fish, coconut oil, nuts and seeds. At the same time, keep in mind that modified fats like hydrogenated or trans fats are the worst choices for brain health.
The science supporting the relationship between carbohydrates and dementia is quite exciting, as it paves the way for lifestyle changes that can profoundly affect a person's chances of remaining intact, at least from a brain perspective.
As a practicing neurologist, I can tell you first hand that working with Parkinson's patients offers clinical challenges. But from an emotional perspective, this disease can border on overwhelming.
While the hippocampus itself doesn't store memories, it serves to triage our experiences based upon their survival significance.
Even slight elevations in blood sugar have been shown to increase the risk of Alzheimer's disease.