Organic material decays and decomposes with age and time. Think a loaf of bread, or that banana that has sat in your fruit bowl for a bit too long. Even consider what a steak would be reduced to if left out for a couple of days.
One McDonald’s hamburger and one portion of fries photographed everyday for over four months, without dramatic change.
Saying “without dramatic change” is being polite, essentially it looks exactly the same.
Admittedly it’s not very appetising, or visually appealing in any way. But that’s not the point. It makes you wonder what exactly is in it, and what level of preservatives have been added to keep it this way!
Enjoy your next trip to the Golden Arches.