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It may be time to switch back to drinking from the tap. A recent study has confirmed that water bottles made with bisphenol A (BPA) significantly raise BPA levels in people who drink out of them.
BPA is a toxic chemical linked with various long-term health problems including heart disease and diabetes. The chemical is found in products such as hard plastic water bottles such as Nalgenes and the liners of some canned food and beverages. Disposable water bottles, however, generally do not contain BPA.
The Harvard study showed that after only one week of drinking from bottles containing BPA, study participants' urine contained over two-thirds higher concentration of the chemical than before.
Your best bet? Stick with stainless steel water bottles, filled from the tap, not the water cooler.
UPDATE 6/3/09: FDA to reconsider safety of BPA.