I have been highly and painfully informed about Dr. Joel Wallach's research  
into Cystic Fibrosis in Humans and other specimens like monkeys. This man as 
far  as I am concerned proved without any doubt that CF was never genetic or 
anything  other than deficiency of the trace mineral selenium. Either selenium 
is lacking  in the mother of the CF patient in questions or the mother is 
chronically  malabsorbing whatever amount she is getting either by way of mild 
food 
allergies  or some other of the many things that can produce an inability to 
absorb  nutrients especially minerals or make vitamins like A from beta 
carotene or  certain B vitamins from brown rice. I am firmly convinced that 
this is 
a cause.  Wallach was put in for a Nobel but that was later taken back. The 
nomination I  believe. He was actually fired from his job for making the 
discovery shortly  after his wife died. Sad story for a great intellect, but I 
think 
people will  eventually find out that this is the cause of cystic Fibrosis. 
Not genes, not  anything else.