Fiber is a type of carbohydrate present only foods derived from plants including fruits, vegetables, legumes, whole grains, nuts, seeds etc., which humans cannot digest but still provides various health benefits including improving gut microbiome health, stabilizing blood sugar levels & lowering cholesterol levels plus more importantly having positive effects on your immune system. It does this mainly by feeding beneficial bacteria living inside us, so they’re better able to produce short-chain fatty acids (SCFA), which enhance intestinal barrier function, thus limiting passage through harmful microbes into our bloodstream, where they cause illnesses. Additionally, fiber promotes the production of IgA antibody – a key component responsible for protecting us against bacterial & viral infections while slowing down chronic inflammatory processes commonly seen in autoimmune diseases such Lupus & Rheumatoid arthritis.