I think it would certainly help. There is a new GAPS book coming out (hopefully next year) called Gut and Physiology Syndrome that claims that autoimmune diseases are caused and healed by the gut (same with psychological disorders). I'm not sure about CF specifically but I really think the diet would help in any case so I would personally look into more. Get onto the GAPShelp yahoo group and you should be able to get some more advice.
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