As mammogram guidelines are debated in the media, I am glad to see someone thinking that perhaps rising breast cancer and asthma rates have to do with environmental pollution, probably endocrine distruptors.
I asked these doctors what they do in their own homes to reduce risks. They said that they avoid microwaving food in plastic or putting plastics in the dishwasher, because heat may cause chemicals to leach out. And the symposium handed out a reminder card listing “safer plastics” as those marked (usually at the bottom of a container) 1, 2, 4 or 5.
The popular Nalgene polycarbonate bottles with a 7 on the bottom are in the "throw out" category, writer Nicholas Kristoff suggests. The company's rather ambiguous position is stated here.