Stuff like Pringles are made from the nastiest rotting potatoes in the planet. It's been 20 years since the last time I set foot in a potato plant, I can still smell it.
A big problem with the food market is that people shop with their eyes, which leads to stupid amount of waste on fruit&vegetables section, as people prefer to go to another store than to buy veggies that look anything less than perfect.
I suppose this is because most animals in the wild are always couple hours away from starvation and just can't afford being picky eaters.
We definitely don't (generally) turn our noses up at various forms of rotten milk or the liquids of fruits rotten enough to be alcoholic.