Thumb sucking, nail biting children more resistant to allergens

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Experts believe that when someone’s environment is constantly sterile, it undermines their immune system.

Thumb sucking is considered a juvenile and immature act, while nail biting is considered unbecoming and unsightly. Parents try—and often fail—to wean their children off of these acts, but new studies suggest that they may not be so bad after all.

Researchers have found that in young children, thumb sucking and nail biting may protect them against allergies.

Published last Monday in Pediatrics, the study compared children who possessed both habits to other children who didn’t; those who sucked their thumbs and bit their nails were far less likely to develop sensitivities to common allergens.

In a Today article, it said that the findings highlight the “hygiene hypothesis,” which suggests that the rates of allergic diseases in kids may be related to our obsession with providing a germ-free environment.

Experts believe that when someone’s environment is constantly sterile, it undermines their immune system.

“It's like having a large standing army with nothing to do,” the Today report said. “Those bored immune system soldiers will look for something to attack, and in some people, that means going after allergens.”

Following 1,037 children born in 1972-1973 for more than three decades, the study performed skin prick tests to its subjects when they were 13-years-old, and again when they were 32.

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