UPF isn't real food, it is industrially produced, edible food-like substance. Dense in calories, light in nutrients. Manufactured not with the objective of delivering nutrition to the consumer, but profit to the manufacturer. In the 1940's the Germans manufactured butter from coal. Today this sounds unbelievable and disgusting, but from what materials are today's foods made?
Mad_Manx above talks about bread. I used to enjoy the fresh M&S bakery bread, until I read the label. Every loaf I picked up contained emulsifiers, preservatives and artifical ingredients. Every M&S sandwich is made from UPF bread. Its near impossible to avoid.
There are dozens of different industrial emulsifiers approved for use by British food manufacturers. It is generally accepted / proven that emulsifiers are bad for the body. Like a detergent, they strip the gut and kill the microbiome which is essential for good health.
The supermarkets shelves are loaded, and our waistlines are growing, so you would think we live in a time of abundance. But how long until the UPF manufacturers are called to account for the impact to health caused by their products, in the same way that cigarette manufacturers were?