GPT and rickets: From the results of this study, performing examinations to assess the cardiovascular risk parameters and serum 25(OH)D could represent a starting point for vitamin D supplementation in overweight and obese children and adolescents affected by hypovitaminosis D. The results of this study could furthermore support the role of vitamin D supplements in improving the levels of the total cholesterol, HDL-C, LDL-C and ALT.