So what. Did you think that food was carefully grown in a sterile lab and delivered to you in a vacuum-packed container? It's grown in the dirt, harvested by day laborers, and stored and transported in big heaps out in the open.

Word of advice to you, sir. If you care about avoiding rat feces, spoiled food, and contamination in general, buy whole foods. For example, buy apples rather than applesauce. Buy steak rather than soylent. When you can visually inspect the thing, you see a lot of defects that are hidden when you grind or mash it all up.