Above-normal blood sugar linked to dementia
There are many reasons to keep your blood
sugar under control: protecting your arteries and nerves are two of them.
Here’s another biggie: preventing dementia, the loss of memory and thinking
skills that afflicts millions of older Americans.
A study published today in
the New England Journal of Medicine shows that even in
people without diabetes, above normal blood sugar is associated with an
increased risk of developing dementia. This finding goes beyond previously seen
links between diabetes and dementia. “It establishes for the first time,
convincingly, that there
is a link between dementia and elevated blood sugars in the non-diabetic
range,” says study author Dr. David Nathan, a Harvard Medical School professor
and the director of the Diabetes Center and Clinical Research Center at
Massachusetts General Hospital.
Dr. Nathan teamed up with researchers across
the country to look at blood sugar levels in more than 2,000 older adults—the
average age was 76—taking part in the Adult Changes in Thought study. The vast
majority of the study participants did not have diabetes. What the researchers
found is that any incremental increase in blood
sugar was associated with an increased risk of dementia—the higher the blood
sugar, the higher the risk.
Why? There are only theories. “The speculation
is that elevated blood sugar levels are causing more vascular disease, but it
may be other metabolic issues. For example, people with elevated blood sugar
often have insulin resistance which may be the link that affects our brain
cells,” says Dr. Nathan.
The study does not prove that high blood
sugar causes dementia, only that there is an
association between the two. For that reason, don’t start trying to lower your
blood sugar simply to preserve your thinking skills, cautions Dr. Nathan.
There’s no evidence that strategy will work, although he says it should be
studied.
But it is worth keeping an eye on your blood
sugar to try to avoid developing type 2 diabetes. This disease is at epidemic
proportions. Almost 26 million Americans—one in 12—have diabetes. High blood
sugar is hallmark of this disease. Normal blood sugar is under 100 milligrams
per deciliter of blood mg/dL after an eight-hour fast. You have diabetes if
your blood sugar is 126 mg/dL or higher after a fast. People with a blood sugar
reading of above 100 but below 126 have what’s called prediabetes. Nearly 80
million Americans are in that camp.
Excess blood sugar is a problem because it
can lead to a variety of health problems including heart, eye, kidney, and
nerve disease.
Taming blood sugar
What if your blood sugar is above normal?
There’s good news in that department: You can lower your blood sugar by
exercising and, if needed, losing weight. Shifting to a healthier diet with
more vegetables, fruits, and whole grains and cutting back on highly refined
grains can also help.
Try to get 150 minutes per week of moderate
intensity activity, such as brisk walking. If that’s daunting, know that even a
little activity can make a big difference in lowering blood sugar levels. Short
but frequent walking breaks—as brief as a minute and forty seconds every half
hour—can lower blood sugar. So can taking a walk after a
meal.
And it doesn’t always have to be official
“exercise.” Try taking the stairs more often, parking farther away from the
store, and getting up and moving if you’ve been sitting too long. “It’s common
sense,” says Dr. Nathan. “The more active you are and the less sedentary, the
more likely it is that your muscles can uptake glucose, and the insulin you
make will be more effective.”
Also helpful is cutting back your intake of
highly refined carbohydrates, especially foods with added sugars such as
sucrose, high fructose corn syrup, and also molasses, cane sugar, corn
sweetener, raw sugar, syrup, honey or fruit juice concentrates. The American
Heart Association recommends no more than 100 calories from sugar or six
teaspoons of sugar per day for women, and 150 calories or nine teaspoons of
sugar per day for men. If you’re in the predictable or diabetic range, you’ll
want to work with a dietitian to determine your exact needs.
Making these changes is an investment, to be
sure. But the payoff—better physical and mental health—is definitely worth it.
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