Exposure to BPA. Bisphenol A (BPA), a chemical commonly found in aluminum and tin cans, has received a lot of attention in recent years. Numerous peer-reviewed studies have shown BPA to be toxic even at low doses and have linked BPA exposure to many health problems including cardiovascular disease, obesity, diabetes, breast cancer, prostate cancer, neurological disorders and infertility. So far, the FDA has banned the use of BPA in baby bottles and sippy cups, but has refused to extend the ban to other products, saying it still needs further evidence.
Source: http://www.healwithfood.org/safety-concerns/pros-cons-canned-vegetables.php#ixzz4NFpsEpFm