(I already mentioned the harmful effects of sugar on the brain and how it really works: Brain - Cancer and Alzheimer's.)
"[...] in diabetics having the highest level of various diabetes associated factors, things like vascular issues or leg ulcers, the risk of becoming demented was increased an astounding 37 fold."
"Even slight elevations of blood sugar, well below the range where diabetes becomes a concern, similarly and significantly predict the future risk for developing dementia as was described last month in the prestigious New England Journal of Medicine."
It is not a few percent increase in the risk of getting Alzheimer's, once we are diabetic. It is a 37 fold increase, which is considerable. Diabetes is a result of high sugar and refined carbohydrate intake. This implies that Alzheimer's is also very much associated with a high-sugar diet.
In this article, for Alzheimer's prevention, they recommend a diet low in carbohydrates and high in fat - the nightmare of health officials.
"Reduce your carbohydrate consumption immediately. Shoot for a total of no more than 80 grams of carbs in your daily diet. This means favoring vegetables that grow above ground like kale, broccoli, spinach, and cauliflower as opposed to those that store carbohydrate in the form of starch like potatoes and beets. It means limiting fruit consumption and being especially vigilant with things like fruit juice. A single 12 ounce glass of orange juice contains a full 36 grams of sugar. That's about 9 teaspoons -- the same as a can of soda."
"Eat more fat. 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. Cooking oils like corn oil and soy oil that have been processed to stay on the grocery store shelf for months or even years have no place in a brain healthy program."