Several theories have been put forward as possible explanations for the increased prevalence of allergic diseases. One of these, known as the “hygiene hypothesis” is based on the increased level of hygiene among today’s populations, resulting in less contact with environmental microorganisms during childhood. As a result, the immune system is not required to work as often and malfunctions may develop.
It has been shown that the consumption of some probiotics in children or adults with atopic dermatitis can effectively reduce certain inflammation markers and the associated symptoms, consequently improving quality of life. Positive effects have also been demonstrated in allergic rhinitis and pollen allergy, improving the symptoms of both.