Because I ate food each day between 1 July 2013 – 31 July 2013, I didn't starve and die. I am receiving ongoing benefit from not being dead. Should I continue paying for all that food?

No, since that food no longer exists. There's nothing the food creator can do. They can't cause it to spoil after you ate it. The massive benefit of not dying allows the price ceiling of food to be very high. But within society there is a lot of competition for nutrients which prevents food from reaching such heights.