Though ostensibly supportive of your claim, the first article says it best a few pages in (surprisingly honest):
"To date, there are no clearly established biological mechanisms that could explain the role of red and processed meat in the process of CRC carcinogenesis."
In other words, we see some small signal in epidemiological studies, and we want to speculate about mechanistic causes, even though this has been tried before to no success.
"To date, there are no clearly established biological mechanisms that could explain the role of red and processed meat in the process of CRC carcinogenesis."
In other words, we see some small signal in epidemiological studies, and we want to speculate about mechanistic causes, even though this has been tried before to no success.