I just learned something fascinating in another thread:

http://forum.lowcarber.org/showthre...723#post7926723

One reason fat can give you diarrhea, it seems, is that you might not produce enough bile to emulsify it. Indeed, I seem to be fine with fat emulsions like mayonnaise and reduction sauce. So maybe it's not a microbial problem at all. I need to start making pate!