I wish we had access to the full article, but for the moment, at least, the information in his blog is a very good start. This blog pertains to a review from the European Journal of Internal Medicine entitled Nutrition and Alzheimer’s disease: The detrimental role of a high carbohydrate diet.
From his blog:
Regarding the role of carbohydrates in Alzheimer's disease:One of the major points made in the paper is this: cholesterol and fat is really important to the brain. It points out that although the brain is only about 2 per cent of body weight, it contains about a quarter of the total cholesterol in the body. The authors point out several roles for cholesterol in the brain, including the synapse – the ‘gap’ where one cell can communicate with another. Communication here is via what are known as ‘neurotransmitters’, which are released by one nerve cell and float across the synaptic gap to exert the effect on the nerve adjacent to it. The authors summarise the importance of cholesterol in the brain like this:
Cholesterol is required everywhere in the brain as an antioxidant, an electrical insulator (in order to prevent ion leakage), as a structural scaffold for the neural network, and a functional component of all membranes. Cholesterol is also utilized in the wrapping and synaptic delivery of the neurotransmitters. It also plays an important role in the formation and functioning of synapses in the brain.
It’s also true that the brain actively takes up cholesterol (in the form of LDL cholesterol). This in itself suggests that cholesterol is desired in the brain and does something useful. Interestingly, a gene defect which leads to impaired cholesterol uptake by the brain is also associated with an enhanced risk of Alzheimer’s disease.
The authors of this review also point out that the fluid that circulates in and around the brain and spinal column (the cerebrospinal fluid) in individuals with Alzheimer’s disease is low in cholesterol and other fats compared to individuals without this disease. Also, those who run low cholesterol levels are found to be at increased risk of dementia.
The red emphasis is mine, of course. It will be very interesting to see where this goes. Will some "experts" try to sweep it under the rug, because it gores one of their favorite oxen, (a low-fat, low-cholesterol, high-carb lifestyle)?What this got to do with carbohydrate, though? As the reviewers point out, carbohydrates raised blood sugar levels, and sugar (either in the form of glucose or fructose) can damage tissues through the formation of ‘advanced glycation end-products’ (AGEs). AGE damage can affect LDL cholesterol, and impair its uptake into the brain.
The authors of the review note also that individuals with type 2 diabetes (who tend to run raised blood sugar levels) have a 2- to 5-fold enhanced risk of Alzheimer’s disease. It’s been suggested that the fundamental problem here is impaired cholesterol availability by the brain.
What we’ve learned from this is:
1. our brains need cholesterol
2. a high-carbohydrate diet is likely to stop our braining getting enough cholesterol
Now, do we have any takers for a low-fat, low-cholesterol, high-carbohydrate diet?
I took a statin, (simvastatin), for 9 months and 19 days, on the recommendation of more than a few doctors, who insisted that I needed to take it to reduce my stroke risk, following a second TIA-like event, last May. I stopped taking it 43 days ago, to see if it was the cause of a stiffness problem with my fingers, that seemed to be getting worse. The problem hasn't totally disappeared, but it seems to be much less noticeable, these days, so I can't say for sure that it was the cause of the problem, but it appears that it might be. When I told my GP that I was going to stop taking it for a couple of weeks, to see if it would make a difference, he suggested that I stop taking it longer than that, to give it a good trial. So, I'm still not taking it, , and the longer I go, the less stiffness problem I seem to have. Anyway, when you're looking for reasons to not take a drug, an article such as this one seems to offer a mighty good reason, so the discontinuation may become permanent.
The big question is, "can we afford to starve the brain for cholesterol?" One thing I would hate to do, is to discover 10 years from now, that taking a statin contributed to my developing Alzheimer's. Statins, may or may not turn out to continue to be popular, but in view of the evidence, I don't see how anyone can, in good faith, defend a low-fat, high-carbohydrate diet.
http://www.drbriffa.com/2011/03/29/carb ... the-brain/
Love,
Tex