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Relationship between carbohydrate intake (average over 7 days preceding donation of stool sample for moderate- and low-carbohydrate diets; average of 3 days preceding stool sample for maintenance) and butyrate concentration in feces. •, maintenance diet; ×, HPMC diet; □, HPLC diet. Correlation, 0.76 (P < 0.001, REML).
