People with high levels of dichlorophenol, a breakdown product of the herbicide 2,4-D and of chlorine used to
disinfect tap water, were more
suffer allergies to
milk, eggs, seafood, and peanuts. It's not clear what could be happening, says Elina Jerschow, MD, MSc, lead author of the study, but she says it may have something to do with the "hygiene hypothesis.