Friendly Bacteria

As reported on the Beeb, a small study of long-distance runners shows that probiotics reduce the number of reported sick days.  It's not clear whether the effect is on endurance athletes (bolstering a stressed immune system) or on skinny people (normalising an unusual gut flora) -- but as a walking sicknote who runs and is planning on doing a fair few long things this year, I'm probably going to give it a try.