I know for a fact that carbon plays a big role far as the cause of the odor. I believe that it may had triggered something like IBS, or IBD or just completely f**ked our system
Sodas = Carbonated water and other carbon related
stuff
and for the few who smmoke stuff which contains god knows , and a massive amount of Carbon
Carbon the odor causing factor
Oh i'am done yet this is just a part of Theory I: the Odor source