In the BPRHS, this ratio was inversely correlated with HOMA-IR (r = −0.069, P = 0.05) and insulin (r = −0.073, P = 0.039), and dietary n-3 PUFA was inversely correlated with insulin (r = −0.072, P = 0.042) after controlling for age, sex, waist circumference, alcohol drinking, smoking status, physical activity, T2D and population admixture. Here, INS is linked to type 2 diabetes mellitus.