eat dirt

http://findarticles.com/p/articles/mi_m0ISW/is_274/ai_n16359659?lstpn=article_results&lstpc=search&lstpr=external&lstprs=other&lstwid=1&lstwn=search_results&lstwp=body_middle
Just found this interesting article about allergies and anthroposophic lifestyles. It is a 1999 study, but makes interesting reading :)