Can Weight Loss Affect Your Period?

Also, while your menstrual cycle may not affect weight gain or loss, losing or gaining weight can affect your menstrual cycle. Women who lose too much weight or lose weight too quickly may stop having a period, or have irregular periods. Women who have obesity may also have irregular periods.

How much weight loss will affect my period?

Just like weight gain, there is no defined amount of weight loss that results in missed periods when starting from a normal weight. The more weight you lose and the faster you lose it, the more likely your period will be affected.

Why does weight loss affect periods?

Excessive or sudden weight loss can cause your periods to stop. Severely restricting the amount of calories you eat stops the production of hormones needed for ovulation. Your GP may refer you to a dietitian if you're underweight, which is when you have a body mass index (BMI) of less than 18.5.