Here, we investigated the preventative effects of four doses of fructooligosaccharides (FOS) in a murine model for house dust mite (HDM)-induced allergic asthma.<h4>Methods</h4>BALB/c mice received a diet containing 1%, 2.5%, 5%, or 10% FOS (w/w) both prior to and during sensitization and challenges with HDM. Here, FOS is linked to allergic asthma.