from mercola.com: Alzheimer’s disease is the sixth leading cause of death in the U.S. This fatal and progressive condition destroys brain cells, resulting in memory loss and severe thinking and behavioral problems (aggression, delusions, and hallucinations) that interfere with daily life and activities. The cause is conventionally believed to be a mystery. While we know that certain diseases, like type 2 diabetes, are definitively connected to the foods you eat, Alzheimer's is generally thought to strike without warning or reason. That is, until recently. A growing body of research suggests there may be a powerful connection between the foods you eat and your risk of Alzheimer's disease and dementia, via similar pathways that cause type 2 diabetes. Some have even re-named Alzheimer's as "type 3 diabetes."
Faulty insulin (and leptin), signaling caused by a high non-fiber carb diet is an underlying cause of insulin resistance, which, of course, typically leads to type 2 diabetes. However, while insulin is usually associated with its role in keeping your blood sugar levels in a healthy range, it also plays a role in brain signaling. In a 2012 animal study,1 researchers were able to induce dementia by disrupting the proper signaling of insulin in the brain. All in all, it seems clear that your diet plays a tremendous part in Alzheimer’s, and the low-fat craze may have wrought more havoc than anyone could ever have imagined. It was the absolute worst recommendation possible, limiting the nutrient you, and your brain, need the most in your diet.
Dr. Ron Rosedale, a prominent expert in the low-carb, high-quality fat approach to improving your health, was possibly the first person to advocate both a low-carb and moderate protein (and therefore high fat) diet. Most low-carb advocates were very accepting of, if not promoting, high protein, and protein was, and still is, often recommended as a replacement for the carbs. However, a high-fat, low-carb diet is very different than a high-protein, low-carb diet and this is a major source of confusion by both the public and researchers when doing studies and publishing conclusions as if all low-carb diets are the same. You cannot live without protein, as it’s a main component of your body, including muscles, bones, and many hormones. We also know that protein was instrumental in advancing our intelligence. However, most people today are indulging in hormone laced, antiobiotic loaded meats conveniently available at fast food restaurants and processed meats in grocery stores.
Your healthiest option is to ensure your carbs come primarily from fresh, organic vegetables, high-quality protein, and eat primary a high fat diet. Depending on the type of carbs (high fiber or not), most people need anywhere between 50-75 percent fat in their diet and sometimes even higher for optimal health.