One of the components that is frequently subbed into plastic containers is bisphenol S, or BPS. Even though it isn't BPA, don't get excited -- scientists at Harvard discovered that it may negatively impact developing fetal brains in the same way BPA does.
"But I'm not a fetus!" you say. Well, fetuses aren't the only ones at risk, since grown-ass adults can still be affected by BPA alternatives, which scientists say work almost exactly like BPA. Basically, if these BPA-free items say they're microwave-safe, they may be lying to your face. In other words, you may be better off not nuking your food on them.
But all of my food is in plastic! What am I supposed to do?
If you have cabinets full of plasticware (which, face it, most of us do), there are a few ways to possibly minimize your rate of plastic ingestion. For starters, don't use the microwave to heat up food on (or in) them. Put yesterday's lasagna on a couple of paper plates or, hey, a regular plate that’s microwave safe -- but not plastic! Also, always try to hand wash plastic dishes and containers, even though it's a huge drag, and don't leave your plastic bottle of water outdoors to bake in the sun, as it can fill your drink with the bad stuff.