The Western part of the world eats fewer fruits and vegetables and has been doing so for the past fifty years. During this time, many more cases of asthma have been reported as well. Researchers feel these reports did not happen by accident or coincidence and are linked.
Research has found in lab mice the occurrence of less asthma and allergic issues in mice that were fed a high fiber diet. Mice that were fed low fiber diets experienced more occurrences of allergic asthma. Dust mite extractions were used to induce an allergic reaction after the mice had been fed specific fiber diets. These results can mean great news for humans due to the fact mice and humans have extremely similar respiratory systems.
Fiber is digested by gut microbes that produce short chain fatty acids while doing so. When an allergen enters the lungs, short chain fatty acids are partly responsible for the expulsion of foreign allergens. Short chain fatty acids travel through the bloodstream and into bone marrow where they greatly influence the creation of immune cells. In the event an allergen enters the lungs, the immune cells are the ones that go fight it.
While this is amazing research, many experts feel more studies need to be done to find more evidence. However, eating a high fiber diet is good for greater, overall health, so eating more fruits and vegetables is important regardless of asthma or allergies.
Another fact that can help support the presence of gut microbes helping the immune system to combat allergic asthma is about pets and small children. Children that are around dogs and cats as an infant have been found to have fewer issues with allergies to pets.