12-Year Old McDonald's Hamburger, Still Looking Good
Well for a food to mold, there are several factors tat need to be met, including acidity, fat content, temperature, moisture content, etc...
Generally, foods with very high fat contents will not mold (such as a mcdonalds burger patty). A normal slice of bread will get quite moldy, but dip it in oil, and it will essentially stay looking fresh forever in a relatively controlled environment.
Just a side note - unless you are eating unprocessed, whole foods - you are eating the same crap that is in mcdonalds. The entire food industry is (like any other industry) concerned primarily with profits, not with peoples health or safety in mind. I am all about the free market, but when it comes to the things we put into our bodies, profit shouldn't trump everything else.

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