There was an interesting study out about age and pregnancy the other day, where women in their 50s who were using donor eggs because of age were compared to younger women using donor eggs because of prior medical complications that meant they didn't have their own. The older women were expected to have higher rates of complications... and didn't. It wasn't age that lead to hypertensive complications - but just the use of donor eggs itself. Here's a discussion of the study: http://www.sciencedaily.com/releases/20 ... 171806.htm
So this supports something we say a lot here: *it isn't something you did*. It's not really lifestyle factors, from what we can tell - women develop this disease because of the unique combination of maternal and paternal genes that make up the placenta. Every lifestyle factor they find is correlated but not causal - as sage says, many overweight and obese women sail through pregnancy, and many thin women develop PE, even if it's also true that more obese women develop PE than do thin women. Probably that's because of underlying genes that make it more likely that you'll become obese in the modern environment *and* make it more likely that you'll develop preeclampsia. Some women with incredibly calm pregnancies, like me, get severe preeclampsia, and some women live in war-torn societies without access to enough food and with relatives slaughtered by the military, and sail through.
It really isn't fair that PE doesn't care if we've done everything right. But it isn't a just disease. It's a brutal disease.