Tis an homage

I see these or memes along this theme pop up occasionally and they completely bypass the more realistic answer. Which is we watch animals eat them or fed them to animals and if they didn't die we knew they were edible. Now real props to those early humans who figured out the foods that require some severe processing first before they can be eaten. They were definitely the type of people that went "I'm gonna eat that." "It'll kill me right now so I gotta figure out how, but I'm gonna eat it."