The September 19 issue of JAMA contained a study that showed that obese children and adolescents have a higher concentration of bisphenol A (BPA) in their urine. BPA, a known endocrine disruptor (messes up your hormones), is found in canned foods, liquids packaged in plastic bottles, and other consumer products, mainly those associated with softer plastics. This study was cross-sectional, so we can't conclude that BPA causes obesity. It could be that obese children eat more canned food, or have more sodas and energy drinks out of plastic bottles. Sodas and energy drinks are also associated with obesity.
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