GSTM1 rs1056806 showed a higher risk of obesity under heterozygote comparison (C/T vs. C/C: OR = 2.02, 95%CI = 1.15–3.55, p = 0.015) and dominant models (C/T-T/T vs. C/C: OR = 1.92, 95%CI = 1.11–3.31, p = 0.019). The gene discussed is GSTM1; the disease is obesity due to melanocortin 4 receptor deficiency.