It is one of the disgusting habits parents try in vain to stop their children from doing in public.
But it may be the wrong reaction to tell a child off for picking their nose and - horror of horrors - eating it.
Experts now insist that, in fact, this unsavoury practice is good for your teeth and overall health, reports the Daily Mail.
They believe that the bacteria collected in the nose could improve the body's immune system if eaten.
Dr Scott Napper, professor of biochemistry at the University of Saskatchewan, Canada, said: "Nature pushes us to do different things because it is to our advantage to have certain behaviours, to consume different types of foods."