You could be right The point is that if somebody isn't eating enough prebiotic fiber, they won't have a healthy gut ecosystem because that's what the good bacteria eat. The body is pretty good at knowing what it needs if given half a chance. Obviously, if somebody has a severe illness, they need a doctor. Also, if you feed the good bacteria, they will do the job of crowding out the bad bacteria. You should write a post on your ideas. I'd love to read it.