A University of Nebraska study has found that microwaving plastic baby bottles releases more than 2 billion nanoplastics and 4 million microplastics per square centimeter. The research, led by Kazi Albab Hussain, tested FDA-approved plastic bottles filled with water and other liquids, heating them for three minutes to simulate typical use.

These tiny plastic particles have already been detected in human blood, with one study finding them in 77% of tested individuals. The concern extends beyond BPA to include PFAS chemicals, dubbed "forever chemicals," which the government estimates are present in the blood of up to 97% of Americans. The long-term health impacts remain under investigation.

While the toxicity of microplastics is still being studied, researchers exposed kidney cells to the particles released during microwaving, finding that about 75% of the cells died. The study's authors recommend avoiding plastic containers in microwaves and suggest alternatives like glass baby bottles and compostable products. As Hussain noted, consumers deserve to know which products release fewer particles, though no "microplastics-free" labeling standards currently exist.