You know it’s not a healthy habit to pop plastic leftover containers in there, but you still do. Here’s why that’s bad: Many plastics contain estrogen-like chemicals (BPA is a well-known one) that can leach into your food when the plastic is heated.
In a study published in Environmental Health Perspectives, 95 per cent of 450 plastic products (such as baby bottles, zipper-top bags and containers) tested released chemicals that acted like estrogen after they were microwaved, washed in a dishwasher, or soaked in water. Even products labeled “BPA-free” released estrogen-like chemicals. Better to be safe and warm up your dinner directly on a plate.