Forcing ultra-processed food through seems like war on the poor.
It's more indifference than malice. And the effect of regulating UPFs on the poor is going to be complex, with no outcomes that are both happy and easy to achieve.
What we're talking about is the product of technology that allows businesses to take cheap (and indeed federally subsidized) ingredients and transform them into ultra-palatable, shelf stable edible products on an *industrial scale*. This makes them really, really inexpensive and available to people who live in areas with low availability of fresh food.
If you calculated food inflation simply based on the foods that mainstream medicine and nutrition want you to eat, it'd be a lot worse. A diet of fresh, whole, minimally processed foods is expensive -- especially vegetables and fruits which are federally classed as "specialty crops" and don't receive significant government subsidies like corn or soy. Even meat is indirectly subsidized; it comes from animals mostly grown on subsidized crops. A recent study out of Oxford concluded that vegetarian diets are more affordable than omnivore diets, but to arrive at this conclusion the study included the impact of diet on medical costs. This kind of long term orientation is something you can't expect of someone who has to buy his food in a dollar store with very little money in his pocket.
The problem with visionary public policies is the unintended consequences. In this case in the name of improving everyone's health, some people are going to pay for that worthy goal by going hungry. To ban UPFs without providing for replacements that will be available to those people is just as indifferent to their welfare as leaving them to have to subsist on that junk. We'd need a moon shot scale program to make high quality real food available to people who are dependent upon UPFs to make ends meet. That's not a bad idea, but it won't happen in the US.
Since an outright ban on UPFs without such a program would likely be catastrophic, what we need now is a lot more research into exactly what it is about UPFs that is problematic. At present the science is convincing, but highly imprecise, starting with the definition of UPFs itself. Take emulsifiers, one of the most common class of UPF ingredients and important making industrial edible products ultrapalatable. They all pass FDA tests for being acutely toxic and carcinogenic of course, but it's beginning to look like many of the common ones, like maltodextrin, carboxymethylcellulose and polysorbate 80, may be harmful to the gut microbiome health, which is believed to be a key factor driving increasing rates of obesity and diabetes. Others, like lecithins and diglycerides don't seem to be harmful, so if the science pans out it would make sense to ban *some* emulsifiers but not *all* of them.
Accelerated research, followed by surgical strikes against specific problematic additives is an achievable and worthwhile goal, because it benefits all consumers and doesn't harm politically powerful agribusinesses as much. Similarly efforts to subsidize the production and distribution of high quality food is something that could conceivably be achieved for similar reasons (it'll put money in the pockets of agribusiness), although there will be opposition to efforts to get that food into low-income areas.