This 2013 study, part of the Contraceptive CHOICE Project, evaluated weight changes over 12 months among 427 women using progestin-only contraceptives: etonogestrel (ENG) implant, levonorgestrel intrauterine system (LNG-IUS), and depot medroxyprogesterone acetate (DMPA), compared to copper IUD users. Mean weight changes were 2.1 kg (ENG implant), 1.0 kg (LNG-IUS), 2.2
