I guess the philosophy is to keep food out of plastic as much as possible. Store your food in glass containers if possible and never heat them up in plastic. Somehow chemicals in plastic leak (for lack of a better word) into your food the longer they are in plastic and especially if you heat it up (i.e. the microwave).
I have been looking at thrift stores for old pyrex dishes with lids to use for storing leftovers, I'll be looking at garage sales too this summer.
The more I read about the icky stuff in our food the more it scares me to death. Lately, I have been reading "Master Your Metabolism" by Jillian Michaels, very good info in there.