LEP and rickets: • Serum 25(OH)D was negatively correlated to serum leptin (r = −0.20, p = 0.027) and to subcutaneous abdominal fat (r = −0.23, p = 0.012). • BMI > 30 kg/m2 was a risk factor of hypovitaminosis D [25(OH)D <30 ng/ml] (OR 4.3, 95% CI 1.21–5.3, p = 0.018).