An industrial chemical most Americans already have in their bodies is back under the microscope. New research suggests that even low-level exposure in the womb can disrupt fetal development, feminizing males and masculinizing females. Worse yet, scientists found these prenatal changes may permanently alter metabolism, immunity and disease risk — potentially setting the stage for cancer and a wide range of chronic illnesses later in life. The culprit? Bisphenol A , better known as BPA, a man-