Florida researchers examine link between cold weather and respiratory illness

As flu season arrives earlier than usual in Florida, researchers are clarifying the relationship between cold temperatures and illness. While traditional folklore suggests that wet hair or drafts directly cause sickness, scientific evidence indicates a more nuanced mechanism.

According to meteorologist Leslie Hudson, cold air can weaken antiviral defenses in the nose, potentially making it easier for viruses to take hold in individuals already exposed. Additionally, indoor heating can dry out the air, irritating nasal passages and further compromising defenses. The U.S. Environmental Protection Agency recommends maintaining indoor humidity levels between 30 and 50 percent to mitigate these effects.

Health experts also emphasize the importance of nutrition and nutrient levels in supporting the immune system. Maintaining adequate levels of vitamins A, C, D, and E is critical for combating oxidative stress, which can weaken immune responses.