Glad you posted this, Katie. I'm kind of wondering the same thing. I just finished flush #17 after drinking apple juice the whole day and got out no stones or anything. Am I clean OR should I do it again without all the juice? I suspect you are onto something there. Possibly fruits cause a small bile "leakage" on their own?
"If I eat grains all day and no fruits... I have had good flushes."
I remember Shelley saying her best flush was after a breakfast of buttered pancakes. My problem would be I can't think of any grains I would want to eat dry, with no fat. Guess I'll have to try it though, just to see.