Analysis of the gut microbiota in the old order Amish and its relation to the metabolic syndrome.

Phyla-level phylogenetic binning of 16S rRNA data revealed a nominally significant correlation between the Bacteroidetes:Firmicutes ratio and age- and sex- adjusted BMI (r = 0.116; p = 0.04), but no significant correlation with metabolic syndrome traits [fasting glucose (r = 0.075; p = 0.19), systolic or diastolic blood pressure (r = 0.016; p = 0.78 and (r = 0.043; p = 0.45), respectively), fasting triglycerides (r = 0.078; p = 0.17), HDL-cholesterol (r = −0.052; p = 0.36); all adjusted for age and sex) Results from unweighted UniFrac analysis [16] also did not distinguish among the subjects based on BMI ( Figure S5 ).

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