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This doesn't seem all that useful. I can't find salads in nature. I can't find bread in nature. I can't find smoothies in nature. I can't find noodles in nature. Are those all bad, processed foods?

> If it didn't exist 150 years ago, or you cannot find it in nature, it's processed food.

Is the corollary true as well? Lead sugar existed a few thousand year ago - so is that processed food?

> If it grows on a plant, or eats plants, or eats things which eat plants, it's not processed food.

Tell that to people who go bugnuts about GMO foods.

> If it didn't exist 150 years ago, or you cannot find it in nature

Start checking on when your favorite variety of apples was first created.

Newer varieties of fruit actually have much more sugar than many heritage breeds. I wouldn't go as far as to say you should avoid them, but that's probably not a valid argument against the rule.