When insulin-related somatic traits (i.e., 2hGlu, BMI, FPG, FPI, HbA1c, HOMA-IR) were considered, OCD was also found to be significantly negatively genetically correlated with BMI (rg = −0.284, p = 2.6 × 10−11), but neither AD nor ASD showed significant correlations with the traits. This evidence concerns the gene INS and Alzheimer disease.