I have been diagnosed with asthma, COPD, and mild emphysema. I also recently had whooping cough, and so have had some alarming breathing periods. I mostly managed by avoiding the allergens that created the asthma, etc., namely wine, cigarette smoke, sulfites .
Gradually, I came to try the gluten free diet when I was wrongly diagnosed with lupus. Many chronic symptoms, including GI, along with chronic rhinitis, improved.
And then I realized that the gluten free was not enough -- all alcohol bothered me, caused my lungs to "clog." So, no beer, no wine -- even sulfite free, no saki, no grain alcohol.
I then pursued anti-candida diet -- amazing results with some of the things I learned about here, including the candida diet. When I have any kind of grain -- or Sugar -- I can't breathe.
And when I take the enzymes to destroy the candida, I breathe freely.