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One thing I think we should better emphasize is that it's best to avoid foods that are bad for you, than to eat foods that are good for you. If you can't do both, you should focus on cutting out bad foods over eating healthier foods.

Meat (non-processed, no sugary sauce or gravy), and dairy (plain, fermented, no added sugar). Those are kind of "neutral" foods. If that's all you eat, meaning you don't eat any crap, you're much better off health wise than if you eat crap and try to also eat a bunch of veggies, fish, fruits, legumes, etc.