PTH and obesity due to melanocortin 4 receptor deficiency: There was also a cross-sectional study, by Durá-Travé et al. (20), showing that adolescents with severe obesity who had vitamin D deficiency had significantly (P < 0.05) elevated BMI Z-scores, waist Z-scores, body fat percentages, fat mass indexes, and PTH values than those with normal vitamin D state.