Earlier quoted context omitted.
The term comes from the Nova classification. https://en.wikipedia.org/wiki/Nova_classification
> Ultra-processed foods are operationally distinguishable from processed foods by the presence of food substances of no culinary use (varieties of sugars such as fructose, high-fructose corn syrup, 'fruit juice concentrates', invert sugar, maltodextrin, dextrose and lactose; modified starches; modified oils such as hydrogenated or interesterified oils; and protein sources such as hydrolysed proteins, soya protein iso…
I am curious what items in the list differ for you. When's the last time you grabbed your isolated fructose and maltodextrin to season your steak?
The way I think of it is if I were to cook a chicken breast or bake a loaf of bread and then write down the ingredients, they'd be chicken, oil, salt, pepper; or flour, water, yeast, salt. Now go look at the ingredients of a chicken breast (raw, marinated, or cooked) and a loaf of bread in the grocery store and note the differences between the ingredient list. If the ingredient list for an item from the store includes things a household wouldn't have at home, like fructose or maltodextrin, that item would be considered ultra processed.
I'll note that I don't eat as healthy as I should, people should do what they want, and it's possible to still be unhealthy while avoiding ultra processed foods.