Can phthalates in plastic food containers cause asthma in children?

What's actually in it

Phthalates are plasticizer chemicals that make plastic flexible. They leach out of plastic food containers, cling wrap, takeout containers, and the linings of some cans. When you heat food in plastic or store oily foods in plastic containers, more phthalates transfer into the food. Pregnant women eat these chemicals every day without knowing it.

Common phthalates in food packaging include DEHP, DBP, and BBzP. They don't bond tightly to plastic, so they escape easily, especially when the plastic gets warm or contacts fatty or acidic foods.

What the research says

A 2026 meta-analysis in Environment International pooled individual-level data from multiple European birth cohorts. This wasn't a single small study. It combined data from thousands of mother-child pairs across several countries, tracking them from pregnancy through adolescence.

The findings were clear: babies exposed to higher phthalate levels in the womb had a greater risk of developing asthma. The link held from infancy all the way through the teen years. That means prenatal phthalate exposure doesn't just cause a brief breathing problem. It can set up a child for years of asthma.

Phthalates are known to disrupt the immune system and lung development during fetal growth. The developing lungs and airways are especially sensitive to these chemicals in the second and third trimesters, exactly when they're forming the structures they'll use for life.

The strength of this study is its size and design. By combining data from multiple cohorts across Europe, the researchers could see patterns that smaller studies might miss. The consistency of the results across different countries and populations makes the findings harder to dismiss.

If you're pregnant, store food in glass or stainless steel. Never microwave food in plastic. Avoid cling wrap on hot food. These small changes can meaningfully reduce how much phthalate reaches your baby.