The present study aims to determine an appropriate individual diet therapy to improve breast cancer patients' nutritional status, to enhance their life quality and health level, to overcome their nutrition barriers and to reduce their medical expences. This study is a randomized clinical trial. The participants of the study must be woman over the age of 18 who have undergone chemotherapy once or three times, howere, those who have to follow a special diet plan, or suffer from diseases other tahn cancer will be excluded from the study. The participants of the study will be 70 woman who are going to be treated by a special nutritional diet therapy for about 2 months. Additionally, at the bigining and at the end of study, the chemotherapy side effects such as, anorexia, adnauseam, diarrhea, constipation, serum albumin, liver enzyme, ferritin, hemoglobin and alkalin phosphatose will be measured and compared between two groups.