Hard plastic bottles continue to draw scientific scrutiny. A new study provides more evidence that a primary chemical in hard plastics wreaks havoc on hormones.

The latest research findings are significant because they consider average exposure to the chemical Bisphenal A, or BPA, while previous studies looked at "high doses" of the chemical. The new findings are specific about how BPA affects the human body.

Researchers found the chemical suppressed a key hormone. Dr. Anna Freitag, who heads up Stamford Hospital's new Diabetes and Endocrine Center, says when this hormone doesn't do its job regulating insulin sensitivity, people are at risk of metabolic syndrome.

Federal Drug Administration officials say they will continue to review information about BPA, but for now, they say there is no ban on products containing it.

Other recent reports link BPA to nervous system and behavioral problems in children. The FDA will hold a public meeting on BPA concerns Sept. 16.