Researchers from the Harvard School of Public Health found that people who drank for a week from the clear plastic polycarbonate bottles increased concentrations of bisphenol A - or BPA - in their urine by 69 percent.
BPA is used in hundreds of everyday products. It is used to make reusable, hard plastic bottles more durable and to help prevent corrosion in canned goods such as soup and infant formula.
Numerous animal studies in recent years suggest that low levels of BPA might cause developmental problems in fetuses and young children and other ill effects. The health effects on adults are not well understood although a recent large human study linked BPA concentrations in people's urine to an increased prevalence of diabetes, heart disease, and liver toxicity.
Bisphenol-A is a widely used chemical additive. The only advice one can really give to pregnant women and families is to try to use stainless steel where possible (water bottles, etc. - check out Sigg and Klean Kanteen, or cut BPA out otherwise. Having canned foods only occasionally, using fresh produce, avoiding the microwave, and cooking in stainless steel pots and pans will greatly reduce the risk of disorders associated with BPA consumption. In short: live naturally, and avoid plastic in unnecessary applications like water bottles.