How Probiotic Yogurt Works

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http://the-scientist.com/2011/10/26/how-probiotic-yogurt-works/

Probiotic organisms in yogurt appear to alter the expression of gut microbe genes encoding key metabolic enzymes, leading to changes in the metabolic properties of the human microbial community. This may be at least part of the reason for the gastrointestinal benefits of probiotic yogurt.

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