There's the NOVA classifications. I'd say the major concerns are refinement, like white bread, white sugar, white rice, most oils are highly chemically processe

There's the NOVA classifications. I'd say the major concerns are refinement, like white bread, white sugar, white rice, most oils are highly chemically processed besides "cold-pressed". On the flip side, foods should ideally be identifiable(look natural), and ideally, according to numerous studies, like on blue zones, where people tend to prioritize fresh fruits and vegetables, prepared 'simply'. The ideal amount of fruits and veggies tends to be around 9-12 servings, daily.