In post-menopause women affected by breast cancer and treated with chemotherapy, overweight and obesity are considered both a risk factors as well as a negative prognostic factors since they increase the risk of early relapse and death. Furthermore, a decrease in weight may also occur during chemotherapy and is associated to a reduced quality of life and survival. Also, the majority of patients under chemotherapy refer dysgeusia, an alteration in taste that can determine food aversion, selection of hypercaloric food or reduced food introduction up to malnutrition. Our aim is to evaluate eating habits changes in patients affected by breast cancer and under chemotherapy treatment and to better understand how this alterations influence the quality of life, anxiety, depression and insomnia of patients as well as overall survival.