Chemotherapy-naive patients will be offered to participate in a two arms study. Following consent, patients will be randomized to one of two arms. Patients in both arms will be provided by booklet and audio-cassette that specify lifestyle recommendations (diet, physical activity and breathing exercises). Patients in one of the study arms will be provided in addition with frozen wheatgrass juice (recommended daily dosage of 55-110 CC daily). Patients in both arms will be asked to fill in a daily patient's diary monitoring the practice of the lifestyle recommendations.