# 2 BPA
Bisphenol A, or BPA, is used in so many products that it’s now detected in sand, household dust, and water. Studies have found that men with high BPA levels in their urine produce lower-quality sperm, making it more difficult to reproduce.
Ladies aren’t immune from BPA’s ill effects, either. A 2010 University of California San Francisco study found that in women undergoing in vitro fertilization, those with the highest levels of BPA in the body produced less-viable eggs.
Found in: Most canned food, some No. 7 plastic, receipts (receipts with the red flecks on the underside are said to be BPA free).
Protect yourself: Opt for fresh or frozen food instead of canned, drink from a food-grade stainless steel or glass bottle, and say no to receipts for minor purchases.