Update on Cinnamon for Blood Sugar Control

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Cinnamon can no longer be considered a safe and effective treatment for diabetes.

The use of cinnamon to help treat diabetes remains controversial. We know that cinnamon is so good at controlling one’s blood sugar that you can cheat on a diabetes test by consuming two teaspoons of cinnamon the night before your glucose tolerance test. Basically, they make you drink some sugar water, and see how well your body can keep your blood sugar levels under control. And, if you eat those two teaspoons right when the test starts, or 12 hours before, you can significantly blunt the spike. A half teaspoon of cinnamon does not seem to be enough, but about a teaspoon a day does appear to make a significant difference. A review of the best studies done to date found that the intake of cinnamon by type 2 diabetics or prediabetics does lower their blood glucose significantly.

So, what’s the controversy? Well, as I described before, cassia cinnamon, also known as Chinese cinnamon—or probably what you’re getting at the store, if it just says cinnamon—contains a compound called coumarin, which may be toxic to the liver in high-enough doses.

Originally, the concern was mainly for kids during Christmas time, where they might get an above-average exposure. But, more recently, some researchers suggest that the kids just sprinkling some cassia cinnamon on their oatmeal a few times a week might exceed the recommended safety limit. The bold values here are above the recommended upper limit. For little kids, just a quarter-teaspoon of cinnamon a few times a week may be too much. And, if you’re eating that cinnamon sprinkled on oatmeal more than like every day, even adults can bump up against the limit. So, a teaspoon a day of cassia cinnamon might be too much for anyone.

But, no problem; just switch from cassia cinnamon to Ceylon cinnamon, and you can get the benefits without the potential risks—right? Well, without the risks, yes; but we’re not sure about the benefits.

Nearly all of the studies showing blood sugar benefits of cinnamon have been done on cassia. We’ve just assumed that the same would apply for the safer cinnamon, Ceylon. But, only recently was it put to the test. “Owing to the presence of [that] toxic [compound], the Federal Institute for Risk Assessment…in Europe has warned against consuming large amounts of” the cassia cinnamon—suggesting a switch from cassia cinnamon to Ceylon cinnamon (also known as true cinnamon). But we don’t know whether or not the true cinnamon had similar benefits, until now.

We saw that nice blunting of blood sugars in response to cassia cinnamon, but in response to Ceylon cinnamon—nothing. Bummer. In fact, they’re thinking maybe that potentially toxic coumarin stuff was the active ingredient in the cassia cinnamon all along. So, take out the toxin; you take out the benefit.

So, they conclude, yeah, it’s great that health authorities are recommending the switch. However, the positive effects seen with cassia could then be lost. So, should we just give up on going out of our way to add cinnamon to our diet? No, I think it’s still a good idea to shoot for about teaspoon of Ceylon cinnamon a day, since there’s a bunch of other benefits linked to cinnamon besides blood sugar control—not the least of which is its potent antioxidant content.

In fact, one of the cheapest food sources of antioxidants—beating out cloves, and coming in just under purple cabbage. But, cinnamon can no longer considered a safe and effective treatment for diabetes. Either you’re using cassia cinnamon, and it’s effective, but may not be safe; or you’re using Ceylon cinnamon, which is safe, but does not appear effective.

But look, even the cassia cinnamon only brought down blood sugars modestly. In other words, only as good as the leading diabetes drug in the world, metformin, sold as Glucophage. Yeah, it may work as good as the leading drug, but that’s not saying much. The best way to treat diabetes is to attempt to cure it completely— reversing diabetes with a healthy diet.

Republished from NutritionFacts.org

Sources cited

Michael Greger

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Michael Greger, MD, FACLM, is a physician, New York Times bestselling author, and internationally recognized professional speaker on a number of important public health issues. He has lectured at the Conference on World Affairs, the National Institutes of Health, and the International Bird Flu Summit, testified before Congress, appeared on “The Dr. Oz Show” and “The Colbert Report,” and was invited as an expert witness in defense of Oprah Winfrey at the infamous “meat defamation” trial. This article was originally published on NutritionFacts.org



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