Scientists know our bodies are full of microplastics. What are they doing to us?

> Campen says you don't see a correlation between age and the concentration of microplastics in human tissue. In other words, it doesn't appear to endlessly accumulate inside us. It's possible that our bodies may reach some sort of "equilibrium" based on how much is around us.

> "We don't have enough data," he says, "but [our work] suggests there's a very rapid time to saturation — you do hit a limit and eventually you're clearing it."

> A study of Zebrafish (sometimes used in biomedical research) found the uptake of microplastics did plateau at a certain point and levels decreased when the animals weren't being exposed. The problem is the saturation point went up proportionally to how much the animals were exposed to, says Campen.