Serum BAs during the mixed-meal tolerance test. A, Total serum BAs. B and C, Serum 7-HCO and 7,12-diHCO during the meal. D and E, Percentage change in total, conjugated, and unconjugated BAs during the meal. *, P < .05, **, P < .01 between obese and nonobese by Mann-Whitney test.