Researchers find environment and microbes shape allergy risk

If you or your child struggles with allergies, you might wonder what's behind it. A new review suggests the air we breathe and the microbes we live with play a big role. Researchers looked at how environmental exposures, like air pollutants and early childhood antibiotics, affect the nasal microbiome and allergy risk. They found that air pollutants can damage the nasal lining and promote an allergic immune response. Early antibiotic use may alter gut bacteria in ways that raise allergy risk. In contrast, farm exposure and microbial diversity seem protective, helping the immune system stay balanced. The review also notes that people with allergic rhinitis often have an imbalanced nasal microbiome, with harmful bacteria growing and protective ones declining. This dysbiosis can trigger inflammation and worsen symptoms. While the review points to promising areas like probiotics and precision medicine, it is a narrative synthesis of existing studies and does not prove cause and effect. The findings depend on the quality of the original research, which wasn't fully assessed.