Ultra Processed Foods. I should have written that in the first place rather than use the acronym, apologies!
The definition is a bit flakey but they're essentially foods that contain emulsifiers, stabilisers, modified starches and so on. Things that you wouldn't find in a domestic kitchen. But also foods that have undergone so much processing that they're barely food. There's growing evidence that they're driving obesity and driving a wide range of health problems and even mental health. It's eye opening how much of our food is UPF and quite difficult and expensive to get away from.