Go Ahead, Bite The Big Apple

If you've never taken a moment to peruse the FDA's Defect Levels Handbook, then you'll probably never want to.  The Defect Levels Handbook is a government publication that lists levels of contamination (mold, insect parts, filth, hair, etc.) in food that are acceptable and pose no health hazard.  For example, pizza sauce may safely contain either 30 fly eggs or 2 maggots per hundred grams (just not both, which is nice).  If you'd rather remain oblivious to what you might be ingesting, then steer clear of this link that contains a complete list of incidental contaminants.