That's just the mass you need to extract the resources that make up the food that one person consumes in a year. Assuming you don't just space the human waste

That's just the mass you need to extract the resources that make up the food that one person consumes in a year. Assuming you don't just space the human waste and instead reuse it you'll be accumulating material that can make up the biomass that will comprise a large and intricate food web that will eventually make up the biomes of large O'Neill cylinder stations.