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Scientific Link Between Sugar and Alzheimer’s Disease Strengthens

Posted By: RumorMail
Date: Friday, 2-Mar-2018 11:45:13

In Response To: Cannabis May Help Rejuvenate the Aging Brain and Ward Off Dementia - Dr Mercola (RumorMail)

Snip

By Dr. Joseph Mercola

Alzheimer’s disease — for which conventional medicine believes there is no effective treatment or cure — currently affects an estimated 5.4 million Americans1, and its prevalence is projected to triple by 2050.2,3 Within the next two decades, this severe and lethal form of dementia may affect as much as one-quarter of the U.S. population. Already, more than half a million Americans die from the disease each year, making it the third leading cause of death in the U.S., right behind heart disease and cancer.4,5

The good news is that lifestyle choices such as diet, exercise and sleep can have a significant impact on your risk. As previously noted by Dr. Richard Lipton6 of the Albert Einstein College of Medicine where they study healthy aging, lifestyle changes “look more promising than the drug studies so far.” As with health in general, your diet plays a crucial role. Processed foods tend to be nearly devoid of healthy fat while being excessive in refined sugars, and this combination appears to be at the heart of the problem.

High-Sugar Diet Significantly Raises Your Risk of Dementia

One of the most striking studies7 on carbohydrates and brain health revealed that high-carb diets increase your risk of dementia by a whopping 89 percent, while high-fat diets lower it by 44 percent. According to the authors, “A dietary pattern with relatively high caloric intake from carbohydrates and low caloric intake from fat and proteins may increase the risk of mild cognitive impairment or dementia in elderly persons.”

Studies also strongly suggest Alzheimer’s disease is intricately connected to insulin resistance;8 even mild elevation of blood sugar is associated with an elevated risk for dementia.9 Diabetes and heart disease10 are also known to elevate your risk, and both are rooted in insulin resistance.

This connection between high-sugar diets and Alzheimer’s was again highlighted in a longitudinal study published in the journal Diabetologia in January 2018.11 Nearly 5,190 individuals were followed over a decade, and the results showed that the higher an individual’s blood sugar, the faster their rate of cognitive decline.
Both Type 1 and Type 2 Diabetics Have Higher Risk for Alzheimer’s

The connection between sugar and Alzheimer’s was first broached in 2005, when the disease was tentatively dubbed “Type 3 diabetes.” At that time researchers discovered that your brain produces insulin necessary for the survival of your brain cells.12 A toxic protein called ADDL removes insulin receptors from nerve cells, thereby rendering those neurons insulin resistant, and as ADDLs accumulate, your memory begins to deteriorate.

Curiously, while low insulin levels in your body are associated with improved health, the opposite appears to be true when it comes to the insulin produced in your brain. Reduced brain insulin actually contributes to the degeneration of brain cells, and studies have found that people with lower levels of insulin and insulin receptors in their brain often have Alzheimer’s disease.

According to researchers,13 “These abnormalities do not correspond to Type 1 or Type 2 diabetes, but reflect a different and more complex disease process that originates in the central nervous system.”

In 2016, researchers at John’s Hopkins department of biology discovered that nerve growth factor, a protein found in your nervous system that is involved in the growth of neurons, also triggers insulin release in your pancreas.14 So there appears to be a rather complex relationship between body insulin, brain insulin and brain function, and we’ve probably only begun to tease out all of these connections.

Case in point, even Type 1 diabetics are at increased risk for Alzheimer’s, even though their bodies don’t produce insulin at all. Melissa Schilling, a professor at New York University, investigated this paradox in 2016. As reported by The Atlantic:15

“Schilling posits this happens because of the insulin-degrading enzyme, a product of insulin that breaks down both insulin and amyloid proteins in the brain — the same proteins that clump up and lead to Alzheimer’s disease. People who don’t have enough insulin, like those whose bodies’ ability to produce insulin has been tapped out by diabetes, aren’t going to make enough of this enzyme to break up those brain clumps.

Meanwhile, in people who use insulin to treat their diabetes and end up with a surplus of insulin, most of this enzyme gets used up breaking that insulin down, leaving not enough enzyme to address those amyloid brain clumps. According to Schilling, this can happen even in people who don’t have diabetes yet — who are in a state known as ‘prediabetes.’”

Sugar Damages Brain Structure and Function

Research16 published in 2013 showed that sugar and other carbohydrates can disrupt your brain function even if you’re not diabetic or have any signs of dementia. Here, short- and long-term glucose markers were evaluated in healthy, nondiabetic, nondemented seniors. Memory tests and brain imaging were also used to assess brain function and the actual structure of their hippocampus.

The findings revealed that the higher the two blood glucose measures, the smaller the hippocampus, the more compromised its structure, and the worse the individual’s memory was. According to the authors, the structural changes in the hippocampus alone can partially account for the statistical link we see between glucose and memory, as your hippocampus is involved with the formation, organization and storage of memories.

The results suggest glucose directly contributes to atrophy of the hippocampus, which means that even if you’re not insulin resistant or diabetic, excess sugar can still hamper your memory. The authors suggest that “strategies aimed at lowering glucose levels even in the normal range may beneficially influence cognition in the older population.”

A similar study17 published in 2014 found that Type 2 diabetics lose more gray matter with age than expected, and this brain atrophy also helps explain why diabetics have a higher risk for dementia, and have earlier onset of dementia than nondiabetics.

As noted by Dr. Sam Gandy, director of the Center for Cognitive Health at Mount Sinai Hospital in New York City, these findings “suggest that chronic high levels of insulin and sugar may be directly toxic to brain cells” adding that “This would definitely be a potential cause of dementia.”18
Even Mild Insulin Resistance Speeds Cognitive Decline

A study19 published just last year also confirmed the link between insulin resistance and dementia, particularly among those with existing heart disease. Nearly 490 seniors were followed for two decades, and as in other studies, those with the highest levels of insulin resistance scored the worst on cognitive tests, especially tests for memory and executive function.

A take-home message here is that you don’t have to be a diabetic to be at increased risk. As noted by senior study author Dr. David Tanne, a faculty member of Tel Aviv University in Israel, “Even people with mild or moderate insulin resistance … are at increased risk over time … Exercising, maintaining a balanced and healthy diet and watching your weight will help you prevent insulin resistance and, as a result, protect your brain as you get older.”
Progress Made in the Development of a Blood Test for Alzheimer’s

In related news, researchers have announced great strides being made in the development of a blood test to detect Alzheimer’s.20 The test is designed to detect amyloid beta, the toxic protein known to accumulate in the brains of Alzheimer’s patients. In a recent trial,21the test was 90 percent accurate in detecting the disease in a pool of 370 participants.

At present, the only way to measure amyloid beta is by brain scan or a spinal tap, both of which are invasive and expensive, and can only detect the disease once it has sufficiently progressed. While promising, further trials must be done to confirm the diagnostic accuracy of the blood test before it can be released and used in medical practice.

One of the most comprehensive assessments of Alzheimer’s risk is Dr. Dale Bredesen’s ReCODE protocol, which evaluates 150 factors known to contribute to the disease. This protocol also identifies your disease subtype or combination of subtypes so that an effective treatment protocol can be devised.

You can learn more about this in “ReCODE: The Reversal of Cognitive Decline,” which is my interview with him. In his book, you will also find a list of suggested screening tests and the recommended ranges for each test, along with some of Bredesen’s treatment suggestions. The full protocol is described in Bredesen’s book, “The End of Alzheimer’s: The First Program to Prevent and Reverse Cognitive Decline.”22


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