We may be dirty, but exposure to common antibacterial chemicals and preservatives found in soap, toothpaste, mouthwash and other personal-care products may make children more likely to have food and environmental allergies.

Researcher Jennifer Savage says, "We saw a link between level of exposure, measured by the amount of antimicrobial agents in the urine, and allergy risk, indicated by circulating antibodies to specific allergens."

The antibacterials and preservatives THEMSELVES do not necessarily cause the allergies, but instead may play a role in the development of the immune system.
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