Allergies are becoming increasingly common in developed countries and the reasons for this increase are not fully understood.
However, several theories have been proposed to explain this trend. The Hygiene Hypothesis suggests that cleaner and more sterile environments lead to under-stimulation of the immune system and increased susceptibility to allergies.
Changes in diet, with a higher intake of processed foods and less fresh foods can also lead to changes in the gut microbiome and immune system making people more susceptible to allergies.
Exposure to chemicals and pollution in developed countries can contribute to the development of allergies by increasing inflammation and altering the immune system.
Genetic factors also play a role in the development of allergies, but they don't fully explain the increase in prevalence of allergies.
Climate change can also influence the timing and severity of allergies by altering growth patterns of certain plants and increasing the level of certain pollutants in the air.
For additional information check out "Why are Allergies Increasing in Developed Countries" in our resource center.