Acorns make great prepper food, because most people have no idea how to make acorns edible. Almost no one looks at an acorn and thinks “food!” That’s because they aren’t edible until they’ve been processed properly.
I had a conversation with a friend, a few years ago, about storing a little extra food around the house in case of emergencies. We both agreed that emergencies happen that prevent us from getting food from the store. Earthquakes and hurricanes are big, grandiose examples of emergencies that shut down access to stores, but smaller emergencies like blizzards, or an identity thief emptying your bank account also happen all the time. As I said, she and I completely agreed that stuff happens.
I have a good variety of food on-hand, including everything from 45 pound pails of hard white wheat and popcorn, to canned soups and chilis. She knew I had a good variety, and said, “I’ll be fine, too, if there is an emergency. I have five pounds of roasted peanuts. I’ll just snack on those until I can get to the store.”