Do heavy metals in drinking water or food raise the risk of high blood pressure during pregnancy?

What's actually in it

Heavy metals enter the body from tap water (lead, arsenic), food (mercury from fish, cadmium from rice and leafy greens), and household sources (lead paint dust). During pregnancy, these metals affect vascular function and blood pressure regulation.

Lead increases blood vessel stiffness and raises systemic blood pressure. Cadmium damages kidney function, which regulates blood pressure. Arsenic promotes endothelial dysfunction. When multiple metals are present together, the effects compound.

What the research says

A 2026 study on metal mixture exposure and hypertensive disorders in pregnancy found that women with higher combined exposure to multiple metals had elevated risk of hypertensive disorders including gestational hypertension and preeclampsia. The mixture effect was stronger than any single metal alone, confirming that cumulative exposure matters.

Preeclampsia is a serious pregnancy complication with risks for both mother and baby. Finding a link to common environmental metal exposures that are often preventable is a significant finding for prenatal care.

Filtering tap water (reverse osmosis removes the most metals), choosing lower-mercury fish (salmon, sardines, tilapia over swordfish and tuna), and avoiding high-cadmium rice varieties can meaningfully lower combined metal exposure during pregnancy.