Our investigation into whether the relationships of the psychiatric traits with body composition are mirrored in their relationships with glycaemic traits (Fig. 3) showed that anorexia nervosa (rg = −0.28; p = 1.8 × 10−7, LDSC) and education years (rg = −0.28, p = 1.0 × 10−12, LDSC) correlated genetically negatively with fasting insulin concentrations. Here, INS is linked to anorexia nervosa.