Same here, regarding processed foods. I've gradually weaned myself off most of them, replacing with whole food equivalents.
For those times when I do want a processed food I either find a product with the least obvious processing, or make my own.
For example, ice cream replaced with chilled natural yogurt. Or if I'm having a hotdog, I'll replace the extruded "meat" product hotdog with a kangaroo sausage (although I haven't yet found a good replacement for the sauce). I make my own oat milk now: rolled oats, salt and a sweetener, sometimes extra bran, blended up and refrigerated. It tastes fine and is less expensive than shop-bought products. The same goes with bread: I generally steer clear of it, but when I get a craving I'll buy the wholemeal boutique stuff from local bakeries or make my own.
And yes, like some of the others here have found, I find there is a noticeable difference when I go on a binge for a day or two on mostly processed foods. Perhaps it's something to do with intestinal flora?