There is a very strong association between preeclampsia and gestational diabetes. This is mediated through a insulin resistance where the body requires more insulin secreted from the pancreas to achieve the sam effect on lowering blood sugar. As you age, your pancreas is less able to secrete insulin and blood sugars rise. If you gain weight, insulin becomes less effective.
The issue of same partner is probably not true. Women who have a new partner have longer intervals between pregnancies. (They had ended one relationship and started another). When one controls for aging between pregnancies, the effect of a new partner is lost.
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