I started cutting them out before I'd even heard the phrase 'UPF' although we never had eaten it much.
All food you buy in the supermarkets is processed to a degree - none of it exists naturally as you buy it. So people who get snarky about cheese being processed, or beef being minced, or jars of passata etc don't really bother me. It's the ingredients I look at.
It's the UPF stuff that is the issue.
I don't always eat breakfast because I leave for work at 7 and don't have chance to eat until lunch. But, if I do, it tends to be scrambled eggs made with butter, eggs royale (without the muffin). That sort of thing.
Lunch would be salad and some protein (eg tuna mayonnaise) or reheated leftovers from the night before.
Dinner is cooked from scratch (or batch cooked and frozen) - chilli, bolognaise, meat/fish and veg/salad, curries. Etc. I'll buy a Thai red curry paste, for example, but there's one in sainsburys which is 'clean' in that the only ingredients are the ones you'd include if you were making it yourself - no added sugars or anything else you wouldn't put in yourself.
My daughters favourite is chicken thighs with skin or pork belly with broccoli and mushrooms cooked in a garlic, (full fat) creme fraiche and parmesan sauce.
We dont eat puddings generally but, if we do, we have whipped double cream and berries. Like an Eton Mess but without the meringue.
I make my own mayonnaise. Haven't eaten shop bought for years. It takes 5 mins, lasts for a fortnight and tastes much nicer.
I only eat (genuinely) healthy fats - eg olive oil, and animal fats eg butter, and lard. Never eat 'industrialised oils' such as sunflower, rapeseed or vegetable - cheap oils that were never intended for human consumption but they're cheap so UPF producers love it...
I never feel bloated any more, never have digestive issues, much more energy, sleep better, joint pain is gone, skin is better, never experience extremes of hunger (eg griping hunger pangs or feeling stuffed) and don't crave junk food either so I don't actually feel I'm missing out.
I listened to the Chris and Xand podcasts on it recently. One thing that really stood out to me was your body not recognising UPF as real food. Which is why you can eat a whole pizza to yourself, or feel hungry again half an hour after eating a takeaway, and can eat a whole tube of pringles without it ruining your appetite! People can generally eat a greater quantity of UPFs than they would the equivalent 'real' food. Something to do with them not triggering the same hormonal/brain responses as 'real' food. It's factory created food facsimiles that look like food but aren't. Your body just doesn't know want to do with it. It fills your belly but that's about it
I've lost around 3 stone over the last few years without trying by cutting out UPFs and cutting down on carbs too. It's not a calorie defect that achieved it either. I used to calorie restrict (1200 cals) and struggled to lose weight but now eat around 1600-1800 calories a day and I'm the same weight now that I was 20 years ago.