Weight loss before (and between) pregnancies may reduce the risk of preeclampsia in pregnant people who are overweight or obese.[1][2] In fact, a higher body mass index (BMI) is associated with a higher preeclampsia risk,[3] as is gaining a greater amount of weight during pregnancy.[4]
Exercise is beneficial before and during pregnancy (when not contraindicated), and it may reduce both the risk of excessive gestational weight gain and preeclampsia.[5][6]