My period became more regular and moved from around a 30-32 day cycle with 6 days of heavy bleeding and 1 day of spotting, to a 28 day cycle with one heavy day, several normal days, and some spotting to taper it off. My cycle essentially became a lot more normal, and I bleed a lot less.
It also made my ovulation (I chart my BBT) more predictable. Losing weight has been wonderful for my health, including reproductive health