How do humans know what’s edible? Nature or nuture? Pink Slime vs GMOs

SO I am going to brave the hypothesis that you can write about Twinkies without having to eat one. Actually I discovered Twinkie image aversion easily overcomes Twinkie the concept, and I don’t just mean examples like the phallic Strangelove Slim Pickens hat tip at right, excuse me? Even to look at the dubiously baked confections is unappetizing, so why do we think they’re edible? This might be a recurring quandary of mine to which short term memory blinds me. Why don’t we try to eat dirt? (Easy for a well fed person to ask.) Where do we get a hunger for breakfast cereals, but not processed pet food? Why do humans stop consuming a fruit at the seed or rind, yet question why those discards fail to interest animal life too? Taste? We grasp that fire consumes nutrients, a toaster sometimes terminally, but how do industrial processes blur how we discern between live food and dead? Is it box art? Which grocery aisle? Sugar and butter are both edible and inedible, with flour it’s the reverse –never mind, that’s not what I meant to write about, I wanted to address the sudden Soylent Greening of PINK SLIME.
I know that vegetarians deride animal flesh for being inhumanely unsavory, but since when have “food activists” been motivated by what’s “gross”? Exactly. Gross has yet to stop sausage makers, and obviously the “Pink Slime” assault on ground beef production is food industry astrotruf. It’s a PR back-burn against the real public outcry, the wildfire of resistance to Genetically Modified GMO Frankenfoods.