The EPA (Environmental Protection Agency) declares BPA a "chemical for concern" and it has been banned in the use of baby products in most states. Consuming it affects your estrogen levels, and according to the Journal of the American Medical Associated, “higher BPA levels were significantly associated with heart disease, diabetes and abnormally higher levels of some liver enzymes.”
"BPA-free" isn't a guarantee that your container is safe; the new plastics that are replacing BPA today could very well be toxic too. It is best to avoid plastics in general and use glass, ceramic or stainless steel instead. Do not put food in plastic containers (or use plastic wrap to cover food) in the microwave.
Stay tuned for more details on perilous plastics in an upcoming article.