Thanks TM;
The plumbing that runs from the gall bladder, plus a tubing from the liver that "Ys" into it goes down to dump in the duodenum (just below the stomach). Mine had clogged up with "sludge" and had backed up enough to cause inflamation with the liver also.So they went down by tubes inserted through the mouth and cleaned out the tubing (roto-rooting, my term

). Then I went on antibiotics for a couple weeks to clear the inflamation, before surgery.
The nurses topld me that when a gall bladder is filled with stones..the stones are the problem; but when it is filled with "sludge" (their word)..the gall bladder is in effect saying, " I quit, I'm closing shop..and I'm outta here!"

You may well have some truth in the fat thing. While I am by no means a vegan or total fat avoider, due to my cholestrol problem I do avoid any heavy fats, and I am no longer a "big" meat eater...At least not like I was when I was working at heavy labor every day..