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Study Finds Drinking Soda Can Accelerate Brain Aging
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Study Finds Drinking Soda Can Accelerate Brain Aging

Don Patrick November 16, 2021

According to results of a new study, people who frequently drink soda are more likely to have deficient memory, less overall brain volume, and a significantly smaller hippocampus, an area of the brain important for learning and memory.

But before you opt for diet soda in lieu of regular soda, be aware that the study also found that people who drank diet soda daily were almost three times as likely to develop stroke and dementia.

Researchers point out that these findings, which appear separately in the journals Alzheimer’s & Dementia and Stroke, demonstrate correlation but not cause-and-effect. While they caution against over-consuming either diet soda or sugary drinks, more research is needed to determine how — or if — these drinks actually damage the brain, and how much damage may be caused by underlying vascular disease or diabetes.

“These studies are not the be-all and end-all, but it’s strong data and a very strong suggestion,” said Dr. Sudha Seshadri, a professor of neurology at Boston University School of Medicine (MED) and a faculty member at BU’s Alzheimer’s Disease Center, who is senior author on both papers.

“It looks like there is not very much of an upside to having sugary drinks, and substituting the sugar with artificial sweeteners doesn’t seem to help. Maybe good old-fashioned water is something we need to get used to.”

For the first study, researchers examined data from about 4,000 people enrolled in the Framingham Heart Study’s Offspring and Third-Generation cohorts. (These are the children and grandchildren of the original FHS volunteers enrolled in 1948).

The researchers looked at people who consumed more than two sugary drinks a day of any type — soda, fruit juice, and other soft drinks — or more than three per week of soda alone.

Among that “high intake” group, they found multiple signs of accelerated brain aging, including smaller overall brain volume, poorer episodic memory, and a shrunken hippocampus, all risk factors for early-stage Alzheimer’s disease. Researchers also found that higher intake of diet soda — at least one per day — was associated with smaller brain volume.

In the second study, using data only from the older Offspring cohort, researchers looked specifically at whether participants had suffered a stroke or been diagnosed with dementia due to Alzheimer’s disease.

After measuring volunteers’ beverage intake at three points over seven years, researchers then monitored the volunteers for 10 years, looking for evidence of stroke in 2,888 people over age 45, and dementia in 1,484 participants over age 60.

Surprisingly, they found no correlation between sugary beverage intake and stroke or dementia. However, they found that people who drank at least one diet soda a day were almost three times as likely to develop stroke and dementia.

Although the researchers took age, smoking, diet quality, and other factors into account, they could not completely control for preexisting conditions like diabetes, which may have developed over the course of the study and is a known risk factor for dementia.

Diabetics, as a group, drink more diet soda on average, as a way to limit their sugar consumption, and some of the correlation between diet soda intake and dementia may be due to diabetes, as well as other vascular risk factors, according to the researchers. However, such pre-existing conditions cannot wholly explain the new findings, they add.

“It was somewhat surprising that diet soda consumption led to these outcomes,” said  Matthew Pase, a fellow in the MED neurology department and an investigator at the FHS who is corresponding author on both papers.

He noted that while previous studies have linked diet soda intake to stroke risk, the link with dementia was not previously known. He adds that the studies did not differentiate between types of artificial sweeteners and did not account for other possible sources of artificial sweeteners.

While scientists have put forth various hypotheses about how artificial sweeteners may cause harm, from transforming gut bacteria to altering the brain’s perception of “sweet,” “we need more work to figure out the underlying mechanisms,” he concluded.

Related Article: Drinking Diet Soda Can Have Harmful Effects On Your Lungs, Brain, Kidneys and Teeth

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Source:
https://psychcentral.com
http://www.bu.edu/

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