It may be related to stomach/digestion issues. I would try a two week juice fast to see if it helped. MH of the Ask Barefoot forum could help you with questions regarding fasting. Here are a couple of sites addressing fecal Body Odor that you may or may not have seen.

http://www.medhelp.org/forums/gastro/messages/37648.html

httphttp://askwaltstollmd.com/archives/antiper.html://answers.google.com/answers/threadview?id=186462