Anything natural is most likely OK? So by your estimation if you were lost in the woods, at least 50% of everything you'd see would not just be edible but actually good for you? I mean, just to cite an example, if you chew the seeds of apples and swallow them you're eating amygdalin, which is a chemical that reacts into cyanide in the stomach. Asbestos is a naturally-occurring mineral.

If anything, entirely the opposite is true. Most things in the world are either inedible (in the sense that they're immediately mechanically harmful to eat) or toxic in some way or another, at least without some "artificial" processing.