Plastic Bottles and Cancer

Dear Dr. Bone,

 I drink a lot of water everyday and got nervous when I was sent a message on-line that drinking water out of plastic disposable bottles, especially if they are hot after being left in the car, poses a risk for developing breast cancer. I even read that Sheryl Crowe thinks this might be why she got breast cancer. Is there any truth to this?

Heavy on H20

Delray Beach

Dear Heavy,

First let me remind you that although water is healthy to drink, Americans (and many of my patients!) think that they need to drink large amounts of water each day to cleanse and “detoxify” their systems. The truth is that the human body does not need quite as much water as one would think and those people that drink water only when they are thirsty are no less healthy. I do see women who are depleted of electrolytes because they drink too much water and urinate so much that they lose potassium and sodium along the way, so be careful.

As for the association between plastic water bottles and cancer, the answer is a bit complicated.  There are different plastic bottles. The pliable ones that are designed to be disposable are made of PET (polyethylene teraphthalate), or a #1. This type of plastic is used in many different products and appears to be safe. The hard plastic bottles (like Nalgene or Lexan) are made out of BPA (bisphenol A). There is controversy about this compound. Some scientists believe that BPA acts biologically like estrogen and could promote estrogen-related cancers.

Until more definitive studies are done, it is best not to take any chances. The “green” advice is to use glass, or an old-fashioned thermos (lined with glass). It is better for the earth and, to my knowledge, glass has not been associated with any particular health hazards.

Dr. Bone