There isn’t an average amount of weight gain during your period — that number will be different for all of us.
However, a 2023 study of 42 women found that their weight was almost one pound higher during their periods than in the first week of their menstrual cycles. This one-pound weight gain was primarily due to fluid retention.
When does period weight gain start? Again, that’ll vary from woman to woman. You may start to experience period weight in the days leading up to your period, and it should go away once your period is over.
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