I don't think that's a convincing explanation of this type of broken trend line, unless there was some event in the early 2000s where everyone suddenly decided

I don't think that's a convincing explanation of this type of broken trend line, unless there was some event in the early 2000s where everyone suddenly decided to eat 10 times as much processed meat...? It's also not solid logic. Granting that processed meat increases colon cancer risk, that does not go to demonstrate that an observed increase in cancer risk is caused by processed meat. That's affirming the consequent.