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Consumption of Dietary Soy Decreases Risk of Dementia

Researchers say that dietary soy is able to lower the risk of dementia with the help of the right bacteria.

Researchers have found that metabolite produced following consumption of dietary soy may decrease a key risk factor for dementia–with the help of the right bacteria.

The study, published in the journal Alzheimer’s & Dementia: TRCI, reported that elderly Japanese men and women who produce equol–a metabolite of dietary soy created by certain types of gut bacteria–display lower levels of white matter lesions within the brain.

“White matter lesions are significant risk factors for cognitive decline, dementia, and all-cause mortality,” said lead author Akira Sekikawa from the University of Pittsburgh in the US.

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“We found 50 percent more white matter lesions in people who cannot produce equol compared to people who can produce it, which is a surprisingly huge effect,” Sekikawa added.

For the findings, the research team measured equol levels within the blood of 91 elderly Japanese participants with normal cognition.

Participants were sorted by their equol production status, and then six to nine years later underwent brain imaging to detect levels of white matter lesions and deposits of amyloid-beta, which is the suspected molecular cause of Alzheimer’s disease.

Dietary Soy
As heart disease is strongly associated with cognitive decline and dementia, equol production could help protect the aging brain as well as the heart. Unsplash

The researchers found that while equol production did not appear to impact levels of amyloid-beta deposited within the brain, it was associated with reduced white matter lesion volumes.

They also discovered that high levels of isoflavones–soy nutrients that are metabolized into equol–had no effect on levels of white matter lesions or amyloid-beta when equol wasn’t produced.

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According to Sekikawa, the ability to produce equol from soy isoflavones may be the key to unlocking protective health benefits from a soy-rich diet, and his team has previously shown that equol production is associated with a lower risk of heart disease.

As heart disease is strongly associated with cognitive decline and dementia, equol production could help protect the aging brain as well as the heart.

Epidemiological studies in Japan, where soy is regularly consumed, have shown that dietary intake of soy isoflavones has been linked to a lower risk for heart disease and dementia.

Also Read: Down Syndrome May Increase COVID Death Risk

“This type of study always catches people’s attention, but we cannot prove that equol protects against dementia until we get a randomized clinical trial with sufficient evidence,” Sekikawa noted. (IANS)

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