This is an exciting time for Alzheimer's research, as new and surprising discoveries are coming out at a rapid pace, and evidence is mounting to support the notion that Alzheimer's is a nutritional deficiency disease. It is an indication of how much progress has been made in recent years to note that 42% of the references in this essay were published in 2008 or 2009. A popular new theory is that Alzheimer's may grow out of an impaired ability to metabolize glucose in the brain. The term "type-3 diabetes" has been coined to describe this defect, which often appears long before any symptoms of Alzheimer's. A shift from aerobic towards anaerobic glucose metabolism in the brain seems to be a harbinger of Alzheimer's later in life, but I argue that the reason for this shift is both to provide a basic ingredient (pyruvate) from which to synthesize fatty acids, while simultaneously protecting them from potentially damaging oxidation. The ApoE-4 allele, which is associated with increased risk to Alzheimer's, clearly implicates defects in fat and cholesterol transport, and the remarkable 6-fold reduction in the amount of fatty acids present in the cerebrospinal fluid of Alzheimer's patients  speaks loudly the message that fat insufficiency is a key part of the picture. The observation that the myelin is degraded in the frontal lobes of the brains of people possessing the apoE-4 allele further substantiates the theory that the myelin repair mechanism is defective.
Cholesterol obviously plays a vital role in brain function. A whopping 25% of the total cholesterol in the body is found in the brain, and it is present in abundance both in the synapses and in the myelin sheath. The cholesterol in both of these places has been shown to play an absolutely essential role in signal transport and in growth and repair.
Given the strong positive role played by cholesterol, it can only be assumed that statin drugs would increase the risk of developing Alzheimer's. However, the statin industry has been remarkably successful thus far in hiding this painful fact. They have managed to make much of the observation that high cholesterol much earlier in life is associated with an increased risk to Alzheimer's thirty years later. Yet they offer not a single study, not even a retrospective study, to substantiate any claim that actively reducing cholesterol through statin therapy would improve the situation for these people. In fact, most damningly, the statin usage evidence that would answer the question was "unavailable" to the researchers who conducted the seminal study.
Beatrice Golomb is an M.D. Ph.D. who heads up the UCSD Statin Study group, a research team who are actively investigating the risk-benefit balance of statin drugs. She is increasingly becoming convinced that statin drugs should not be recommended for the elderly: that in their case the risks clearly outweigh the benefits. She makes a strong case for this position in an on-line article available here . The section on Alzheimer's is particularly compelling, and it points out the pitfalls in relying on previous studies done by the statin industry, where often those who have memory problems as side-effects of the statin drugs are excluded from the study, so that the results end up inappropriately biased in favor of statins. In summary, she wrote: "It must be emphasized that the randomized trial evidence has, to date, uniformly failed to show cognitive benefits by statins and has supported no effect or frank and significant harm to cognitive function."
In addition to refusing to take statin therapy, another way in which an individual can improve their odds against Alzheimer's is to consume plenty of dietary fats. It seems odd to suddenly switch from a "healthy" low-fat diet to an extremely high fat ketogenic diet, once a diagnosis of Alzheimer's is made. A ketogenic diet consists, ideally, of 88% fat, 10% protein, and 2% carbohydrate . That is to say, it is absurdly high in fat content. It seems much more reasonable to aim for something like 50% fat, 30% protein, and 20% carbohydrate, so as to pro-actively defend against Alzheimer's.
I highly recommend a recent book written by the pediatric brain surgeon, Larry McCleary, M.D., called The Brain Trust Program . This book gives a wealth of fascinating information about the brain, as well as specific recommendations for ways to improve cognitive function and avert later Alzheimer's. Most significantly, he recommends a diet that is high in cholesterol and animal fats, including an abundance of fish, seafood, meat, and eggs. He also recommends coconuts, almonds, avocados and cheese, all foods that contain a significant amount of fat, while encouraging the avoidance of "empty carbs." His knowledge on this subject grew out of his interest in helping his young patients heal more rapidly after brain trauma.
Our nation is currently bracing itself for an onslaught of Alzheimer's, at a time when baby boomers are approaching retirement, and our health care system is already in a crisis of escalating costs and shrinking funds. We can not afford the high cost of caring for the swelling population of Alzheimer's patients that our current practices of low-fat diet and ever expanding statin usage are promoting.