Hear me out. There’s nothing innate to an object that makes it “food”. It’s an attribute we give to certain things that meet certain qualities, i.e. being digestible, nutritious, perhaps tasty or satisfying in some way, etc. We could really ingest just about anything, but we call the stuff that’s edible “food”. Does that make it a social construct?
Food is a category made up of human edible materials, usually providing nutritional benefits. There is a larger social construct AROUND food. Like a burrito is a construct, it being a product of Mexican culture is a construct, it being transformed into a “Cali Burrito”, people who have burrito bumper stickers, the type of place you think of when someone says “a burrito joint”. All social constructs. But food itself, I wouldn’t consider a social construct, no.