SCD and type 2 diabetes mellitus: While the inverse association of estimated SCD1-18 activity with T2D risk appeared to be stronger in participants with lower Zn levels (HR = 0.79, 95% CI 0.64–0.97) compared to those with higher Zn levels (HR = 0.98, 95% CI 0.83–1.16), there was no statistically significant interaction.