It's probably involved a dozen or more individuals at different points in the process. Farmers, farmhands, processing plant workers, truck drivers, van drivers, stock clerks at the store, cashier at the store, store management that selected the product for the shelves, and you... But...
Then there's your oven. That's got power or gas going to it right? More people helping you make your bread. Did you read how to make bread in a book? Add editors, copywriters, researchers, and the author to your list. You starting to see how everything you do is aided by people you don't know?