very likely liver, again. . . Certianly it's a big factor. please see the link in my post to Angel, just down from yours.
The link opens to a page of two articles, or extracts--I forget which-- from the great liver and gallbladder book, that ought to be required reading for everyone on cz. Not only that, but it's a good, gripping read--I found it as quick and readable as a good novel.