We cut down UPFs last year after I watched the Chris Van Tulleken programme where they analysed the effects of UPFs on his brain and the read Ultra Processed People. I think he's a good egg and his advice is sensible.
It is really, really hard to go totally UPF free if you ever want to eat outside the house but we aim for 80% UPF free and noticed a big improvement. Particularly with digestion. If I eat a McDonald's, which I still do sometimes then I really notice how bloated and uncomfortable I am afterwards.
We made simple swaps for our biggest UPF culprits and it's genuinely been easy. People saying "crisps and chocolates are still UPF" well, not necessarily. It depends entirely on the ingredients. I think a lot of people get confused between processed and ultra processed food. It's worth reading up on if you're interested in finding out more. It isn't that it is health food
Nobody is saying that Haagen Daaz vanilla ice cream (which is UPF free) is healthy, but it's a better option for a treat than a McFlurry.
Some examples of easy supermarket swaps we've done are:
Bread - Jason's sourdough. They now have various sliced loaves as well as rolls available in a lot of supermarkets. Crosta and Mollica do packets of wraps that are also UPF free. I occasionally make my own loaves but realistically needed an easy swap that I can just sling in the shopping trolley most weeks.
Cereal - there are a couple of brands of granola and muesli (e.g Bio and Me) that are UPF free which I'll buy sometimes but they're expensive. I've swapped the kids to Shredded Wheat which is 100% wheat or they'll have a slice of the Jason's toast with peanut butter instead (Pip & Nut is our favourite which is just nuts.)
Yoghurt is an easy one, just buy plain greek yoghurt and have it with fruit.
Crisps - there are brands out there that are just potatoes, oil and salt. Lidl do a white packet of ready salted crisps that are our go to.
Ham - swap cheap sliced ham for parma or serrano that is just pork and salt.
Cheaper cream cheese is normally UPF free whereas Philadelphia etc isn't.
Proper block butter instead of spreads.
I tend to just make my own pasta sauces with olive oil, garlic, chilli flakes, tomatoes etc but Heinz do a range of jars that are UPF free so that with a bag of dried pasta and some frozen veg would be a really easy store cupboard meal.
Kikkoman soy sauce is UPF free for making stir fries.
I agree that dinners are easy if you aim to cook from scratch using whole ingredients.
I don't aim for perfection, just improvement. Particularly with the food that DDs are eating as some of the statistics around UPF consumption in children are shocking but then looking at the majority of packed lunches children at school have it's not so surprising.