Results of [2-13C]glucose breath tests.

(A) Changes in expired 13CO2 levels after the oral administration of 100 mg/kg of [2-13C]glucose in OLETF rats at 6–12 weeks, 15–18 weeks, and 21–24 weeks of age. (B) Changes in expired 13CO2 levels after the oral administration of 100 mg/kg of [2-13C]glucose in LETO rats at 6–12 weeks, 15–18 weeks, and 21–24 weeks of age. Data are represented as mean ± SD.