NEW YORK (AP) – A provocative new study suggests a connection between the BPA chemical used in food packaging and childhood obesity, but the researchers say their findings don’t prove it’s the cause.

While most people have traces of the plastics chemical in their bodies, the study found that children with the highest levels in their urine were twice as likely to be obese as those with the lowest.

There are other factors that could explain the results, and many reasons why children gain too much weight, the researchers said.