Ever been scolded by parents for biting your nails—or caught yourself doing it to your kids? Science reveals a unexpected upside: these habits may offer protection against certain allergies.
Researchers from New Zealand's University of Otago discovered that nail biting and thumb sucking expose individuals to microbes on the hands, potentially building allergy resistance.
In their study, just 38% of nail biters or thumb suckers developed allergies, compared to 49% of those without these habits. Among children who did both, the rate dropped to only 31%.
Experts caution this isn't a green light to encourage the behaviors—it's a fascinating insight into microbial exposure and immunity.
