Why is food decay a necessary process?

Sammy Hatzenbihler: Food is organic (living) matter. All organic matter decays. And all organic matter, including our own bodies, can be food for some other organic matter. Decay of organic matter is necessary for a rather obvious reason: if it didn't decay, there would soon be no room for new organic matter.

Wilburn Denice: Food decay is actually food being fed to other things like bacteria. We call it food decay because bacteria got to it first before us. Sooo, the trick is to use our food for our own bodies before the bacteria gets it. Techically speaking without food "decay" we humans (or anything else) could not make use of it. In fact without food decay there would be no food.