Recipients of an allogeneic BMT often experience fatigue as a side effect due to several factors, including high-dose chemotherapy and/or radiation therapy as well as stress from everyday activities that increase fatigue. In addition, after transplantation, the patient's ability to maintain regular nutritional needs (usually due to the unique diet that is required to help increase marrow function) is affected, which further increases fatigue levels. Researchers want to use information learned in this study to find out if nutritional intervention can help decrease fatigue levels and increase caloric intake.