Insulin dose (U/kg/day) was lower in obese individuals compared to normal BMI, with mean (95 % CI) 0.72 (0.62–0.83) vs. 0.88 (0.84–0.92) U/kg/day for diabetes duration <5 years and 0.84 (0.77–0.92) vs. 0.99 (0.97–1.01) U/kg/day for duration ≥5 years. This evidence concerns the gene INS and diabetes mellitus.