From an article Women with polycystic ovary syndrome (PCOS) have been shown to have increased blood levels of the industrial chemical bisphenol A (BPA). PCOS is a hormonal disorder with symptoms that include irregular periods, acne, excessive body hair and difficulty becoming pregnant. It may affect up to 10 percent of women. A study of more than 70 women with PCOS found that they had, on average, higher blood levels of BPA than women without the syndrome. According to Reuters: "... [R]esearchers focused on BPA because the chemical is a so-called endocrine disruptor with weak estrogen-like activity. It's also ubiquitous. BPA has been used for decades to make hard plastic containers, including cups and baby bottles, and in the lining of metal food and beverage cans."