Vincentelli C, et al. - Changes in serum anti-Mullerian hormone (AMH) levels were evaluated in reproductive-age severely obese women after bariatric surgery (BS). In 39 women (mean age 34.6 ± 1.1 years, range 18–45) that underwent a sleeve gastrectomy or Roux-en-Y gastric bypass (RYGB), they measured AMH levels retrospectively at baseline, and 6 and 12 months after BS. Findings suggested a drastic reduction in AMH levels at 1 year after BS in these women which was not related to weight loss. A negative impact of BS on ovarian reserve was thus revealed, at least in the short term.