Almost 90 per cent of teenagers have gender-bending chemicals from plastic in their bodies, according to a study. Bisphenol A (BPA) is found in plastic containers and water bottles, on the inside of food cans and in till receipts. The chemical, used since the 1960s to make certain types of plastic, mimics the female sex hormone oestrogen, and has been linked to low sperm counts and infertility in men, as well as breast and prostate cancer. A study by the University of Exeter, whose researchers tested urine samples from 94 teenagers, found 86 per cent had traces of BPA in their body. Experts fear it is all but impossible to avoid the chemical, given the widespread use of plastic packaging for food. The study's co-author Professor Lorna Harries, from the university's medical school, said: 'Most people are exposed to BPA on a daily basis. In this study, our student researchers have discovered that at the present time, given current labelling laws, it is difficult to avoid exposure by