FTO and obesity due to melanocortin 4 receptor deficiency: Obesity risk for inactive FTO rs9939609 homozygous men was significantly higher compared to inactive homozygous women (OR = 3, 95% CI 1.2–7.52; p = 0.019 and OR = 1.58, 95% CI 1.05–2.38; p = 0.03, respectively).