Inclusion Criteria:  Females Age 18-38 years Overweight or class I and II obesity (BMI 25-39.9kg/m2) Free of major psychiatric illnesses Electing to start the Sprintec (norgestimate/ethinyl estradiol 0.25mg/35mcg) COC or the Mirena or Liletta (Levonorgestrel 52mg/device) IUD.  Exclusion Criteria:  Diabetes Use of medications thought to affect body weight, energy intake, glycemic parameters, or estrogen (i.e. systemic glucocorticoids, stimulants, weight loss pharmacotherapy, metformin) History of bariatric surgery History of polycystic ovarian syndrome History of congenital adrenal hyperplasia Use of a different COC or IUD within the past 3 months (previous users of non-hormonal copper IUD will not be excluded) Planning pregnancy Planning to stop contraceptive within the next 6 months Recent therapeutic abortion or miscarriage in the past 3 months Pregnancy with delivery in the past 6 months Currently lactating Transmen who were assigned female at birth Use of other forms of reproductive hormones such as testosterone or dehydroepiandrosterone (DHEA)