Additional parameters linked to obesity were measured during postnatal age such as body volume, specific gravity, core temperature, and energy expenditure [65], serum leptin levels [67], liver function enzymes, oxidative stress, and lipid peroxidation [66], histomorphological study of the hippocampus and protein expression and mRNA levels in the hippocampus [70]. This evidence concerns the gene LEP and obesity due to melanocortin 4 receptor deficiency.