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A diet soda a day might affect dementia risk, study suggests – The Columbus Dispatch
American Heart Association News (AP)
One or more artificially sweetened drinks a day was associated with higher risk of stroke and dementia, a new study suggests.
The research, published Thursday in the science journal Stroke, examined consumption of beverages sweetened with sugar and artificial sweeteners but did not find that same association with sugary beverages. The results, however, come with a host of caution flags raised by experts. They say the study does not even hint that regular sugary drinks are better for you, or even that artificially sweetened drinks were associated with higher risk of strokes or dementia.
The studys lead author said the observational study shows an association or trend in a group of people and not a direct cause-and-effect link. Its more hypothesis-generating.
The jury is still out, and this just shows people need to be cautious, said Matthew Pase, Ph.D., a fellow in the department of neurology at Boston University School of Medicine and an investigator at the Framingham Heart Study.
Previous studies have looked at artificial sweeteners impact on stroke risk. Pase believes this is the first study to look at its association with risk of dementia and he hopes the work will spur more research into the effects of these sweeteners on the brain.
Researchers analyzed the self-reported diets of two sets of people participating in the Framingham Heart Study, the longest-running heart study in the U.S., funded by the National Heart, Lung, and Blood Institute and run in partnership with Boston University. The study examined beverage intake of 2,888 people over the age of 45 for its stroke analysis and 1,484 people over the age of 60 for the studys dementia analyses.
Over seven years, researchers used food frequency questionnaires up to three different points in time. They then followed up for the next 10 years to determine who developed stroke and dementia.
At the end of the follow-up period, researchers counted 97 strokes, or 3 percent of the participants in the stroke analysis arm of the study. Of those, 82 were ischemic. The study found 81 cases of dementia, or 5 percent of the participants in the dementia arm of the study. Of those, 63 were diagnosed as Alzheimers disease.
The study found that people who reported drinking at least one artificially sweetened drink a day compared with less than one a week were 2.96 times as likely to have an ischemic stroke, caused by blood vessel blockage, and 2.89 times as likely to be diagnosed with dementia due to Alzheimers disease. The results were adjusted for variables such as age, sex, caloric intake, diet quality, physical activity and smoking.
Pase and other researchers say the work points clearly to the need to investigate the possible biological reasons artificial sweeteners might affect the brain and the need for more experimental and clinical trials.
We need to be cautious in the interpretation of these results, said Rachel K. Johnson, Ph.D., past chair of the American Heart Associations Nutrition Committee and professor of nutrition at the University of Vermont. It doesnt prove cause and effect. When you see these kinds of associations, you want to always ask what is the biological plausibility, what is the mechanism that might be causing this?
But, Johnson said, there is a part of the issue that is settled science.
We have a robust body of literature on the adverse effects of sugary drinks. Absolutely the message is not to switch to sugary drinks, she said.
Studies linking added sugars and conditions that lead to cardiovascular disease the No. 1 cause of death in the world have been around for years. Diets high in added sugars have been connected to heart risk factors such as obesity and high blood pressure.
In 2012, the AHA and the American Diabetes Association issued a scientific statement on the use of artificial sweeteners, saying "that when used judiciously, [artificial sweeteners] could facilitate reductions in added sugars intake. The statement called for further research on non-nutritive sweeteners and cardiovascular risk but noted that limiting added sugars is an important strategy for supporting optimal nutrition and healthy weights.
Consumers shouldnt overinterpret the latest studys results, said Christopher Gardner, Ph.D., director of Nutrition Studies at the Stanford Prevention Research Center and a professor of medicine at Stanford University. Gardner was lead author on the 2012 statement.
Its a tricky thing, said Gardner, who leads research into how people can optimize their diets. Nobody ever said diet sodas were a health food.
For many people, such as people with diabetes or obesity, he said, diet sodas can be part of the gradual switch from sugary drinks.
So, the bottom line is, Have more water and have less diet soda, he said. And dont switch to real soda.
Pase, who studies how people can change behavior or diet to prevent dementia, said people need to be skeptical when deciding whether to select something with artificial sweeteners or real sugar.
Just because a beverage is advertised as being healthy because it doesnt have any sugar doesnt mean that it is healthy, Pase said. Artificial sweeteners may have effects in the body that we havent begun to explore.
Excerpt from:
A diet soda a day might affect dementia risk, study suggests - The Columbus Dispatch
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