To my my own knowledge and what i really discover we need to be more sensetive because  if everyone looked after their unique microbiome , and STOPPED eating processed foods , thats fast foods, manufactured foods , sodas , colas , the products the food industry sells us as good is actually damaging you. if its advertised its chemicals wrapped up in pretty packaging making a huge profit, real foods , they grow, herbs , nuts seeds, eat as much as you like of whole foods, - stay away from sugars and anything with a list of ingredients you would not have in your kitchen. FEED your immune system - feed with as much variety of healthy organic or permaculture real plants and real food - look up about microbiome- read prof Tim Spector, spoon fed .