Are engineered nanoparticles in processed food safe to eat?

What's actually in it

Engineered nanoparticles are added to food on purpose. Titanium dioxide (TiO2) makes candy, frosting, and coffee creamer white. Silicon dioxide (SiO2) keeps powdered spices and supplements from clumping. Zinc oxide and iron oxide are used in fortified foods and supplements. These particles are smaller than 100 nanometers, tiny enough to cross cell membranes and enter tissues that larger particles can't reach.

The EU banned TiO2 in food in 2022, but it's still allowed in the US and many other countries.

What the research says

A 2026 review in Food Chem Toxicol gathered evidence on the occurrence, exposure levels, and toxicity of engineered nanoparticles in food. The findings raised red flags.

Nanoparticles showed up in a wide range of processed foods. At the nano scale, these materials behave differently than their larger versions. They can cross the gut barrier, enter the bloodstream, and accumulate in the liver, kidneys, and other organs.

Lab studies found nanoparticles caused oxidative stress, inflammation, DNA damage, and disrupted gut bacteria. The review noted that current food safety regulations weren't designed to evaluate nano-sized materials and may underestimate the risk.

Reading ingredient lists helps: look for "titanium dioxide," "silicon dioxide," or "E171" and "E551." Choosing less processed foods and whole ingredients avoids most engineered nanoparticles.