Inclusion Criteria:  Leukemia or lymphoma patient at MD Anderson Children's Cancer Hospital Patients receiving prednisone and/or dexamethasone therapy at MD Anderson Children's Cancer Hospital at time of enrollment Karnofsky performance status greater than or equal to 70 Must be cleared by treating oncologist to participate in study Must live close enough to attend measurement sessions at one of the clinical centers  Exclusion Criteria:  Patients receiving nutrition counseling or weight management counseling elsewhere Pediatric patients who are already receiving steroids that are not part of treatment History of psychological disorders as indicated in the medical record (eg: eating disorders, depression)