While the exact cause of preeclampsia is complex, a man’s genetic makeup and preconception health significantly impact the risk. The father provides half of the fetal and placental genes; certain paternal genetic variants, poor heart health, and obesity are linked to higher preeclampsia rates in partners.The father's involvement in a preeclamptic pregnancy involves several key factors:Paternal Genes & Epigenetics: The father's genetic material determines half of the placenta's makeup. Specific paternal DNA patterns or epigenetic markers in sperm can cause abnormal placental implantation or poor blood vessel development.Preconception Health: Men with two or more metabolic syndrome characteristics (such as high blood pressure, high cholesterol, or elevated blood sugar) are significantly more likely to father a preeclamptic pregnancy. Paternal obesity is also recognized as an independent risk factor.Prior History: Studies show that men who have fathered a preeclamptic pregnancy are twice as likely to father another one, even with a different partner. Similarly, men who were born from a preeclamptic pregnancy have a higher risk of fathering one themselves.Immune Adaptation: Preeclampsia is sometimes triggered by the mother's immune system reacting to "paternal antigens". Reduced exposure to these antigens—such as in a short-term relationship, changing partners, or using donor sperm—has been linked to an increased risk of the condition.For comprehensive information on this topic, you can read the research published in the National Institutes of Health or read about the effects of paternal heart health provided by the Preeclampsia Foundation.