What is ultra-processed food?

The linked page helpfully explains the different definitions of processed foods:

- Group one: Unprocessed and minimally processed

- Group two: Processed culinary ingredients

- Group three: Processed (a mix of group one and group two ingredients)

- Group four: Ultra-processed

The page says: "Ultra-processed foods usually contain ingredients that you wouldn’t add when cooking homemade food. You may not recognise the names of these ingredients as many will be chemicals, colourings, sweeteners and preservatives."

This surprised me: "[Ultra-processed] includes baked beans, tinned soups, meat alternatives, soy and drinks used as dairy milk substitutes."