Eligibility Details:  
        Inclusion Criteria:
          1. Women;
          2. Age 18-45 years inclusive;
          3. BMI 23-40 kg/m2 inclusive;
          4. HbA1C ≤ 6.0% or fasting plasma glucose < 126 mg/dL;
          5. Weight stable (± 3 kg) during the 3 months prior to enrollment;
          6. Women must be > 9 months post-partum;
          7. For PCOS: A documented history of PCOS from their physician according to the Androgen
             Excess (AE)-PCOS criteria: (defined by the presence of hyperandrogenism (clinical
             and/or biochemical), ovarian dysfunction (oligo-anovulation and/or polycystic
             ovaries), and the exclusion of related disorders (eg. hypoadrenalism, ovarian tumors)
          8. Regular menstrual cycle for females without PCOS
          9. Able to provide written, informed consent.
        Exclusion Criteria:
          1. Postmenopausal women
          2. Women with hysterectomy
          3. Pregnancy, lactation or < 9 months postpartum from the scheduled date of screening.
          4. Fasting plasma glucose > 126 mg/dL, or HbA1c > 6% or diagnosis with Type 2 Diabetes
             (T2D) or Type 1 Diabetes (T1D)
          5. History or presence of cardiovascular disease (unstable angina, myocardial infarction
             or coronary revascularization within 6 months, clinically significant abnormalities on
             EKG), presence of cardiac pacemaker, implanted cardiac defibrillator.
          6. Liver disease (AST or ALT >2.5 times the upper limit of normal)
          7. Kidney disease (creatinine >1.6 mg/dl or estimated GFR <60 ml/min)
          8. Dyslipidemia, including triglycerides >500 mg/dl, LDL >200 mg/dl
          9. Anemia (hemoglobin <11 g/dl)
         10. Thyroid dysfunction (suppressed thyroid-stimulating hormone, elevated TSH <10 µIU/ml
             if symptomatic or elevated TSH >10 µIU/ml if asymptomatic)
         11. Uncontrolled hypertension (BP >160 mmHg systolic or >100 mmHg diastolic)
         12. Elevated hsCRP or known active infection
         13. History of cancer within the last 5 years (skin cancers, with the exception of
             melanoma, may be acceptable)
         14. History of drug or alcohol abuse (> 3 drinks per day) within the last 5 years. Current
             drug use may be determined by plasma or urine drug screens.
         15. psychiatric disease prohibiting adherence to study protocol.
         16. History of organ transplant.
         17. Known history of HIV, active Hepatitis A, B or C or tuberculosis.
         18. History of bariatric surgery.
         19. Current smokers (smoking within the past 3 months).
         20. Current use of beta-adrenergic blocking agents.
         21. Use of oral or injectable anti-hyperglycemic agents: metformin, sulfonylureas, DPP IV
             inhibitors, SGLT-2 inhibitors, thiazolidinediones, acarbose, GLP-1 analogs and insulin
             unless willing to undertake a washout period of 15 days for metformin and GLP-1
             analogs and undergo subsequent laboratory screening tests.
         22. Gonadotropin Releasing Hormone (GnRH) and/or Antiandrogen use within the last 2
             months.
         23. Use of any medications known to influence fat and/or energy metabolism (eg growth
             hormone therapy, glucocorticoids [steroids], etc.)
         24. Initiation or change in hormone replacement therapy within the past 3 months
             (including, but not limited to thyroid hormone, estrogen replacement therapy or In
             Vitro Fertilization therapy).
         25. Current treatment with blood thinners or antiplatelet medications that cannot be
             safely stopped for biopsy and testing procedures.
         26. Not able or willing to have DXA scans or are above the acceptable weight limit (450
             lbs) of the DXA scanner.
         27. Presence of any condition that, in the opinion of the Investigators, compromises
             participant safety or data integrity or the participant's ability to complete study
             visits.
         28. Not able to participate in MRI assessments due to:
               1. Metal implants (pacemaker, non-removable body piercings, aneurysm clips) based on
                  Investigator's judgment at screening
               2. Physical limitations or equipment tolerances (e.g., MRI bore size) based on
                  Investigator's judgment at screening
               3. Inability to tolerate MRI imaging without sedation or claustrophobia