IGF1 and obesity due to melanocortin 4 receptor deficiency: Because exercise is the current best option when it comes to restore metabolism and obesity inflammation problems (i.e. for MetS and T2D), and because exercise is one of the most potent IGF-1 synthesis/freeing mechanisms, it seems logical to correlate them and establish IGF-1 as a target for future options in the multifactorial treatment for metabolic syndrome.