Meditation Reduces Colds

This study looked compared the effects of meditation (MBSR) or moderate exercise on the incidence of acute respiratory infection.  Both meditators and moderate exercisers had substantially fewer colds, but the meditators had the best results.

Since I began meditating daily about 2.5 years ago, I have not had a cold (knock on wood), which is a massive record for me.  Slight confound, I also began adding about 5000 IU of vitamin D to my already substantial vitamin intake around that time.