Here's an article about a 12 year old McDonalds burger. The author is clearly anti-McDonalds. But they make a powerful point.
The burger on the left is from 1996, the one on the right was just purchased. The 12 year old burger has not been frozen, or had any special treatment except that it was stored on the shelf in a plastic container. Go read the whole article.
I used to like McDonalds. Until about 5 minutes ago.