[trux]

Frankly told the above mentioned documents or threads spoke more about nausea than diarrhea. Till now I got only little information when searching for diarrhea and lactic acid, and most of it speaks about the positive effect of the lactic acid bacteria.

I suspect the diarrhea may be caused by the diaphragmatic contractions and vasoconstriction. I did not look up the search results closely, but see some hits for the term diarrhea here in the forum search, and there are some documents for the expression "apnea diarrhea" in Google. I just head to bed so won't research it now, but hope you or someone else can look at it closer in the meantime.