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In a series of posts on its website, McDonald's answers customers' frequently asked questions about its food in the U.S., including "Why doesn't your food rot?"
The answer? "In the right environment, our burgers, fries and other menu items could decompose," McDonald's maintains.
In the right environment, our burgers, fries and other menu items could decompose
the burger doesn't rot because it's small size and relatively large surface area help it to lose moisture very fast. Without moisture, there's no mold or bacterial growth. Of course, that the meat is pretty much sterile to begin with due to the high cooking temperature helps things along as well. It's not really surprising. Humans have known about this phenomenon for thousands of years. After all, how do you think beef jerky is made?
Same with the burger, it dries out left in the open. If you kept the burger in a container it would rot.
Heck. I have seen pizza in my own house sitting around for a week, no rot.