When waist circumference was replaced by BMI, none of the osteocalcin forms were associated with risk of type 2 diabetes with an ORQ4 of 0.92 (0.64–1.32) for tOC, 0.84 (0.59–1.21) for ucOC and 1.05 (0.73–1.50) for %ucOC in the final model. Here, BGLAP is linked to type 2 diabetes mellitus.