Recent research tells that our immune system is mainly located in out digestive system. About 80% of the immune system lives in the gastrointestinal tract and probiotics can help. Probiotics, unlike antibiotics, can replenish the microflora in intestinal tract and promote a number of health-enhancing functions, including digestive function. They are found in unfermented and fermented milk, yogurts, miso, tempeh, soy drinks and some juices (http://instituteofhealthsciences.com/probiotics-help-immune-system-in-your-gi-tract/).
Our digestive systems get astonishing amount of solid foods and liquids from the entire meals of our lifetimes. Making right choices of these individual meals help our digestive systems to extract healthy compounds, process waste and to fend off nasty microbes. These are prerequisites to be healthy, feel well, make stomach lean, soothed, keep diseases away and be cancer-free.
Here are key advices on what you need to eat and why: http://www.besthealthmag.ca/best-eats/digestion/the-foods-to-eat-for-a-healthy-gut#YSkr4oW2RWdxDzIA.97