The body-fat cluster variables showed a positive association with the oxytocin-specific PGS and the first PC–PGSoxt for T2D and the second PC–PGSoxt for SCZ, and a negative association with the second PC–PGSoxt for BD, and the body-fat cluster principal component showed a positive association with the second PC–PGSoxt for SCZ. The gene discussed is OXT; the disease is type 2 diabetes mellitus.