You started a GLP-1, the scale finally moved, and you expected to feel like yourself again. Instead you feel softer, tired in a way sleep won’t fix, and your clothes fit different but not better. The medication did its job. The part no one warned you about is what it does to your muscle, and what that means for women already in perimenopause. Here is what is happening in your body, why it hits harder after 40, and how to protect the results so they hold long after the prescription ends.