Microplastics are a growing concern. As more plastic materials become integrated into our daily lives, it is believed that humans are ingesting them at a higher rate than in years past. Some studies show the increase to be as much as six times what it was in 1990. While microplastics may seem like a health buzzword, the studies are accumulating, and the scope of risk to our health is difficult to predict. Using a microwave isn't unsafe, but chucking any old plastic container or food wrap into is where problems can arise. To find out whether microwaving plastic is a dangerous habit in need of breaking, I spoke with public health experts and toxicologists to learn about the risks of exposing various kitchen containers and packaging materials to microwave radiation. Here's what they said. Microwaves can cause food storage containers to leach chemicals into food. An expert explains how to avoid the issue altogether.…