Family history, alterations in BRCA1 or BRCA2 genes, lifestyle, eating habits, consumption of alcohol, calorie intake, sedentary lifestyle, obesity and reproductive habits, such as the delay in childbearing age, hormonal contraceptive use, the reduction of the number of children and the abandonment of breastfeeding, are related to the risk of breast cancer [25]. The gene discussed is BRCA2; the disease is obesity due to melanocortin 4 receptor deficiency.