Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/t3l0iv on 2023-06-26 06:49:32+00:00.

If people are eating much more processed food and are exposed to more carcinogens than they were in the past, why isn't cancer more common than it used to be? I read somewhere that the rates of cancer have remained the same for all of human history. Maybe my facts are just wrong.