French Doctor, Frederic Saldmann, has written in his book La Grand Menage (Spring Cleaning) that suppressing our natural bodily functions is making us ill. He recommends we all burp, fart and sweat at will. He has some other rather sensible suggestions including not eating whilst walking.
Really, what I find incredible is that we need telling! It seems pretty obvious to me that when things want to come out of our bodies we ought to let them. So let it rip.