Bisphenol A or BPA is considered an endocrine disruptor because it can mimic estrogen. New research suggests it may also have an impact on the thyroid gland. Scientists measured BPA levels in pregnant women and then tested the mothers and their newborn babies for thyroid function. Higher BPA levels in the second half of pregnancy were associated with lower levels of thyroid hormone. Male infants had higher levels of thyroid hormone when BPA was elevated late in pregnancy. This was measured through TSH, or thyroid stimulating hormone. BPA is a plasticizer found in polycarbonate containers and the linings of cans, cash register receipts and water supply pipes.
[Environmental Health Perspectives, online Oct. 4, 2012]