The study published in the journal Microbiome also shows that drinkers had fewer bacteria known to check the growth of other harmful germs.
“Our study offers clear evidence that drinking is bad for maintaining a healthy balance of microbes in the mouth and could help explain why drinking, like smoking, leads to bacterial changes already tied to cancer and chronic disease,” said the study’s senior investigator and epidemiologist Jiyoung Ahn from New York University of Medicine.
According the study, drinkers had more of the potentially harmful Bacteroidales, Actinomyces, and Neisseria species, and fewer Lactobacillales, bacteria commonly used in probiotic food supplements meant to prevent sickness.
Ahn said her team’s next steps were to work out the biological mechanisms behind alcohol’s effects on the oral microbiome.
Ahn suggested acids in alcoholic beverages make the oral environment hostile for certain bacteria to grow.
Another reason, according to her, could be the buildup of harmful byproducts from alcohol’s breakdown, including chemicals called acetaldehydes, which are produced by certain bacteria, such as Neisseria.
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