FABP2 and type 1 diabetes mellitus: There was a significant difference in I-FABP levels between the three study groups (T1D, active CD, and T1D-CD) and healthy controls: 1153 ± 665, 1104 ± 916, 1208 ± 878 vs. 485 ± 416 pg/mL, respectively; (p < 0.001) (Figure 1).