Allergy is caused by an excessive reaction of the immune system to certain substances known as allergens also increased sensitivity of the body. Allergen is a substance possessing antigenic strength, that is, causing the production of antibodies when it enters the body. Allergens can cause an allergic reaction by entering the body in different ways. The most common allergenic foods are milk, eggs, crustaceans and molluscs, nuts, wheat, soy and chocolate.
Also, the allergy can be caused by dust mites, mycophites (molds and yeasts), certain foods, some medicines. A sedentary lifestyle is recommended, even in allergic individuals. Sports activity is also recommended for people with difficulty breathing due to allergies. It is better to prefer disciplines that require a sustained effort in which the increase in pulmonary ventilation is moderate and is achieved with a respiratory rate that is not high but prolonged. Recent studies would also highlight the beneficial effects of probiotics to prevent allergies in children.