Intermittent fasting does not result in amenorrhea or irregular periods. Hundreds of women have participated in intermittent fasting studies and neither of these adverse effects has ever been reported. However, amenorrhea or irregular periods can occur if you lose too much body fat and drop below a body mass index (BMI) of 18.5. You can check to see if you are staying within the healthy BMI range by using this handy calculator.
Important note: If you have any medical conditions or are taking prescription medication of any kind for any condition at all, we highly recommend speaking with your physician prior to commencing any new diet, eating or exercise regime.