INS and type 2 diabetes mellitus: In the T2DM patients, the fecal propionate level correlated negatively with the insulin level (r = −0.269, p = 0.045) and the HOMA-IR value (r = −0.282, p = 0.035), and it correlated positively with the γ-GTP (r = 0.416, p = 0.001) and TG (r = 0.308, p = 0.037) levels.