In particular, overweight and obesity are risk factors for breast cancer in post-menopause women since they are associated to higher level of circulating estrogens, insulin, insulin-like growth factor levels, leptin, adiponectin, growth factors (such as hepatocyte growth factor) and inflammatory cytokines (TNFα and Interleukin-6 (IL-6)). Moreover, they reduce sex hormone binding globulin (SHBG) plasma levels. Overweight and obesity are also negative prognostic factors for breast cancer in post-menopause women since they increase the risk of early relapse and death. An increased weight (2.5-6.2 Kg) is commonly reported during chemotherapy treatment in post-menopause women. This is due to increased appetite, hyperphagia and hydric retention associated with reduced metabolism and physic activities. However, the weight gain during therapy is still not recognised as a negative prognostic factor.