Just finished a very interesting article on “Ultra processed foods” (https://www.theguardian.com/food/2020/feb/13/how-ultra-processed-food-took-over-your-shopping-basket-brazil-carlos-monteiro). Apparently a Brazilian scientist came up with the idea along with a scale called “Nova”, from 1-4. (Note: canned sardines are level 3).
And David might especially like this website of healthy low-Nova recipes: https://www.panelinha.com.br/
Here’s a database of foods worldwide.