The Association of Diet, Intestinal Microbial Starch Utilizers and Butyrate-Producers in Early Life.

In the longitudinal CARE cohort, infants who harbored both starch utilizers and Anaerobutyricum hallii at one year had higher fecal butyrate levels than those without these species.

• Why it matters: Early-life diet shifts toward solid foods, and resistant starch is an early substrate for gut microbes; linking colonization patterns to fermentation helps explain how butyrate capacity develops.
• What they did: Using longitudinal infant samples from the CARE cohort and complementary in vitro assays, they tracked Ruminococcus bromii and Bifidobacterium adolescentis starch utilization and Anaerobutyricum hallii butyrate production, including co-cultures and fecal measurements.
• The result: Resistant starch intake began at 4 months; fewer than one quarter had starch utilizers at 5 months, rising by year one, and in vitro co-cultures showed R. bromii with A. hallii produced more butyrate via reducing sugars than via lactate/acetate cross-feeding.

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