Kefir, a fermented probiotic milk can help maintain balance of good bacteria in your digestive system. It can also improve blood pressure levels.

In addition, kefir supplementation restored the natural balance of four different bacteria in the gut and of an enzyme in the brain essential for normal nervous system function, suggesting that the nervous and digestive systems work together to reduce hypertension, the results showed.
"Our data suggests that kefir antihypertensive-associated mechanisms involve gut microbiota-brain axis communication during hypertension," said the researchers including Mirian Silva-Cutini, of Auburn University in Alabama, US.
The findings will be presented at American Physiological Society's (APS) annual meeting at Experimental Biology 2018 in San Diego.
Previous research has shown that an imbalance in the gut's colony of bacteria (microbiota) may cause high blood pressure in some people.
Similarly, probiotics -- live bacteria supplements that are beneficial to the digestive system -- have been found to lower blood pressure, but the mechanisms by which this occurs are unclear.
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