"I've heard using plastic food containers is dangerous."
Bisphenol A (BPA) is a chemical found in products made with plastic including cups, the inner lining of aluminum cans, and some water bottles. These plastics are labeled with the number 7 in a triangle.
Tests have shown that BPA is linked with various health problems such as cancer, thyroid disease, early puberty in girls, and hyperactivity.
Because BPA leaches out into food at a faster rate when heated, avoid putting #7 plastics in the microwave or dishwasher.
The next time you use your microwave, use glass instead of plastic to heat foods.