Fiber does much more than keep you regular—it plays a key role in hormone regulation, detoxification, and long-term health. During perimenopause, estrogen levels don’t just decline — they fluctuate wildly. Sometimes they’re low (causing hot flashes, anxiety, poor sleep), and sometimes they spike higher than your body needs because progesterone is lower and can’t “balance” it out.. Your liver helps process and clear these excess hormones, and fiber plays an important role in t