I have never heard of a person whose asthma improved significantly through
dietary change. If such a person exists I would love to hear about her/him.
I know that I have been eating paleo, but I still can't take a walk in cold
air without wheezzing and becoming short of breath.

Jean

i have two friends who cured themselves totally  from asthma.
one is in India,  under the influence of dr Varma in Kerala started a
totally raw diet mostly vegan with some raw buffallo dairy. after years of
symptoms they disappeared very quickly with this new diet . i have to
precise he is very poor and can't afford lot of foods .

as soon he is introducing  some cooked foods back , symptoms reappear

the other one is french living in a village of the pyrennees known for his
centers for asthmatic patients ( very dry climate ) who have been suffering
from the disease since childhood complicated with emphysema .
he  started the instinctive eating diet at age 62 and got rid of all asthma
symptoms in a few months ,8 years later when i met him he could do long walk
in the mountain , what he have never be able to do before . he still have
the scars of emphysema but otherwise don't have asthma anymore .

jean-claude