Statement: All the primary trial participants must reduce the number of calories in their diets by a quarter throughout the duration of the study.
Primary_evidence: INTERVENTION 1:    Behavioral Dietary Intervention   Beginning 2-4 weeks after completion of lumpectomy, patients receive food diaries to complete for 7-10 days. Dietary counselors then give patients guidelines for dietary modifications to reduce caloric intake by 25% of their normal diet. Patients follow caloric restricted diet for 10 weeks (2 weeks prior to radiation therapy, during 6 weeks of radiation therapy, and at least 2 weeks after radiation therapy). Patients undergo radiation therapy QD 5 days a week for 6 weeks.   Behavioral dietary intervention: Receive caloric restricted dietary intervention   Therapeutic conventional surgery: Undergo definitive lumpectomy   Radiation therapy: Undergo radiation therapy   Counseling intervention: Receive dietary counseling   Quality-of-life assessment: Ancillary studies