I have heard about this before several years ago, that Alzheimer's Disease is related to diabetes. It has resurfaced as a school of thought in this article and video.
" The "why" makes sense once you know how insulin works. Insulin is how your body regulates blood sugar — it prompts cells to pick up sugar from your blood and use that sugar as energy. When you eat a high-fat, high-sugar diet (as many Americans do), the cells are overwhelmed by all the sugar and stop reacting well to insulin. This is called insulin resistance, a condition that if left untreated, leads to type 2 diabetes.
All the sugar that's left in your blood stream by insulin resistance then wreaks havoc over the rest of your body, causing heart disease, nerve damage, eye damage, and more. When this damage reaches your brain cells, you lose memory function and become disoriented. Or in other words, some researchers say, you develop Alzheimer's."
Read the full article here: http://www.everydayhealth.com/diabetes/0927/i...
I have a few issues with the connection, but I do see how continued assaults on our brains from highs and lows can cause memory loss. It's a very interesting theory.