That beneficial substance identified is the plant sugar molecule arabinogalactan . It has been well known for some time that children who grow up on farms are less prone to allergies and allergic asthma. However, just what it is that protects them remained a riddle for a long time until now. European researchers collected and analyzed stable dust from diverse farms in Germany, Austria, and Switzerland. What they found was arabinogalactan, a large sugar molecule, prevented excessive alertne…