Linking long-term dietary patterns with gut microbial enterotypesOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers examined whether long-term dietary patterns relate to gut microbial community types, called enterotypes, in humans. The cross-sectional cohort (COMBO) included 98 healthy adults; a second controlled-feeding cohort (CAFE) included 10 subjects.
How was it studied?
Diet was assessed with a recent-recall questionnaire and a long-term food-frequency questionnaire, paired with 16S rDNA sequencing of stool samples. In CAFE, 10 subjects were sequestered on a high-fat/low-fiber or low-fat/high-fiber diet for 10 days, with stool, rectal biopsies, and shotgun metagenomics collected.
What did they find?
Fecal communities clustered into two well-supported enterotypes distinguished by the ratio of Bacteroides to Prevotella. The Bacteroides enterotype tracked long-term intake of animal protein, amino acids, and saturated fat, while the Prevotella enterotype tracked carbohydrates and simple sugars. In CAFE, microbiome composition shifted detectably within 24 hours of a diet change, but no subject switched stably between enterotypes over the 10-day study.
Why it matters
The findings suggest gut enterotypes reflect habitual, long-term diet rather than short-term food choices, and that short-term diet changes alter microbiome composition without reassigning enterotype. This distinction matters for interpreting dietary interventions aimed at reshaping the gut microbiome.