My other half was a diagnosed asthmatic for most of her adult life (20ish years) until a few years ago when she finally decided to research it to the ends of the earth, and get rid of it. She eventually succeeded, and as of several years ago was formally tested as asthma free.
That being said, she’s now had Soylent 1.0 as the majority of her diet for 2 months (as have I) and has reported that her allergies in general have entirely vanished. All her general congestion that continued even post-asthma, along with seasonal allergies and related issues from doing tons of gardening just about every single day… just completely went away and hasn’t returned. Now it’s possible that it’s just a coincidence I suppose… but in all the time I’ve known her (going on 14 years) I’ve never known her to have so much as a single month without a trace of allergy symptoms. She’s breathing easier than ever, and her sinus headaches are gone as well.
So maybe this isn’t quite what you were looking for in terms of a reply, but maybe you’ll find it helpful anyway.