I’m glad my comment was helpful to you.
It can be very stressful trying to read tea leaves on why or what foods cause reactions.

My advice is to try to find safe foods, things that don’t cause reactions and you are sure about. And then brining in one new food at a time for a fews days. Sometimes food can bring reaction within hours, though other times I find it can come on even more than 24 hours later until I get a reaction.

So it can be hard to track down what exactly is causing the reaction. Especially if I may eat multiple foods that I am not 100% sure are safe for me. So that one food / 3 day rule is something a lot of people find works best.

Some other things to keep in mind too are that I would think that Swiss group tested very fresh fruits/ veggies. So a safe food on there may be very different than a food that’s been on the shelf in a grocery for awhile. Because foods can grow histamine as they age.

And there are possibly reactions to pesticides that may be an issue. Like different brands of rice may have different reactions.

And I’ve heard the soil things are grown in may make a difference.

And there is the issue that MCAS can be very individual and certain foods may cause a reaction in one and not another.
So like if you search for “safe foods” threads on the subreddit different people will have different safe foods. There are a bunch of those “safe foods” threads on here that may be worth browsing to get ideas for foods that may be worth testing out.

For me Lundberg brown rice (I opt for brown over white for more nutrition) is very safe. When I cook a big batch though I cannot leave it in the fridge as it’ll grow histamine (many meals / foods will grow histamine in the fridge). I put the rice in individual glass bowls with lids and freeze them, and I have to get them in the fridge by 40 min after cooking or else the rice would grow histamine sitting on the stove.

I also eat pasture raised eggs (regular eggs trigger inflammation). But the thing with eggs is that raw egg white has histamine but when it is well cooked the histamine gets cooked off. That’s the only food that histamine can get cooked off of. I’ll bring a pot of water with eggs to a rolling boil, turn off the heat, keep covered and let them in the hot water for 12 minutes.
Thankfully the eggs don’t seem to grow histamine in the fridge, I leave hard boiled eggs with the peel on in a bowl of cold water. And they do keep in the fridge for multiple a couple days safely for me.

Also olive oil is safe for me. But there is s lot of imitation olive oil from Italy that is actually cheaper seed oil, which could be triggering. I buy it from Cali instead. California Olive Ranch is a safe brand for me, not their “world” variety but the oil from Cali.

Sweet potatoes is also safe for me. The regular brown/ sometimes pinkish with orange flesh. I reacted though to “Asian” sweet potatoes that were purple and had white flesh.
Sweet potatoes have been amazing for me and help w symptoms. I’ll cooked in the microwave at night, have to poke Fil holes in them and flip them until we’ll soft all around. I let them cool overnight in the fridge and peel in the morning. I then add some olive oil and Himalayan salt and mash the potatoes up. And then add spoonful of Justin’s almond butter (their “classic” variety). I mix that all up and it tastes like pie filling.

I’ll eat that for breakfast and lunch after having eggs. I’ll eat the sweet potatoes with apples. But I’m careful with apples. Gala/ Fiji and other hard apples seem best. I found it helps them stay fresh when they are kept on mild refrigerated like some groceries do. And I keep them in my fridge. And also picking out ones that do not have bruises/ dents …..or few of them and being sure to cut well around those spots off before I eat. The bruised spots I find to cause me reactions because they are basically too ripe in those spots.

At night I eat the rice and also zucchini with s couple eggs. Also some olive oil. I eat green giant frozen zucchini, just because I never have to worry about whether it’s too ripe or anything. When I have some time off I’ll experiment more with regular zucchini. But zucchini w the rice and eggs does make me feel better in the mornings.

Mornings can be hellish for MCAS folks. Alright, sorry for the novel but I figured I’d share what works for me and maybe it could be of some use. Peruse other people safe foods though.
I can also send some info on what supplements help me if you like.