BAriaTric Surgery After Breast Cancer Treatment (BATS)

Inclusion Criteria: * Diagnosis of breast cancer in the previous 10 years and currently disease free. * Completion of breast cancer treatment (radiation, chemotherapy) at least \> 6 months prior to enrollment * Body mass index (BMI) of ≥ 35 kg/m2, but \< 50 kg/m2. * 18 through 67 years of age at enrollment * Deemed healthy enough to undergo bariatric surgery, if assigned intervention, as determined by a surgeon and documented in the medical record. * Must have insurance coverage with no exclusion for obesity related treatment or management of obesity related surgical complications - in general insurance coverage is available for persons with a BMI ≥ 35 kg/m2. * Anticipated ability to abide by study requirements demonstrated in part by, but not limited to, successful completion of run-in assessments. * Willingness to accept randomization into either interventional group. * Provides voluntary written consent prior to performance of any research related activities. Exclusion Criteria: * Cardiovascular event (myocardial infarction, acute coronary syndrome, coronary artery angioplasty or bypass, stroke) in the past six months. * Current evidence of congestive heart failure, angina pectoris, or symptomatic peripheral vascular disease. * Cardiac stress test indicating that surgery or lifestyle would not be safe. * 12-lead EKG indicating that surgery would not be safe. * Significant anemia (hemoglobin 1.0 g/dL or more below normal range) or history of coagulopathy. * History of st…