I've got MCAS too, meaning as you will well know already, no processed food, no additives, no preservatives & no sugary or salty food either as that exacerbates my Pulsatile Tinnitus & after eliminating all that there's not much left I can eat, so maybe on the plus side, I've lost a lot of weight but having said that, I look a lot older, as people do when they quickly lose weight, so may be not a plus side after all.
More than just unprocessed etc. for me MCAS likely life long has meant not tolerating 100s of foods (and meds).
Now with the jabs triggering the MCAS, histamine has become an additional problem (causing nauseous sinus headaches).
So I'm at around 50 foods/drinks, but always re-testing, rotating, keeping low, using the enzyme DAO to reduce the histamine.
(Like baked beans 50-100g with none of the above, and am taking a good part of the tomato sauce out - which begs the point).
Pleased to be able to tolerate walnuts again after 2 years, cos so healthy and an interesting taste.
Luckily I tolerate and love foods that I just have to bite into, certain raw veggies & apples, nuts, dry fruit, green beans in a jar.
Unluckily I've all but lost my appetite for steamed cabbage however prepared, like with apples. Chopping up for 10' isn't the problem, if I'd still like it.
My only "recipes" mean hardly doing anything, esp. not cooking, don't tolerate warm, but don't like it much either, e.g. putting the green beans in a bowl with yogurt, or a new one: lamb's lettuce/rapunzel salad with yogurt or roasted pumpkin seed oil and apple vinegar, plus Provençal herbs.
I sometimes like the smell of others' food, so often ask for a sniff, but wouldn't at all like to eat it, and hate the taste if I do try.
Had to "unvegan" with goat/sheep jogurts & specks of cheese and and 1 egg to keep my appetite from dropping too low.
Today I've lost 10% since autumn 2022. My GP said under 10% is not considered a medical problem nowadays...
I can imagine reducing to more normal weight may mean less fatigue and less pain.
My wife doesn't like me getting skinnier, and I hardly manage to cream my face to counteract wrinkles.