There's an old study I usually pull up for threads like this where they tried to kill rats by implanting them with cancer and then feeding them various meat products. Bacon was particularly disappointing, it seemed to have an anti-cancer effect. The researchers theorized that the salty bacon was making the animals thirsty, and the extra water the animals were drinking was fighting the cancer. I never came across an follow up studies giving rats extra salty food or force-feeding them water to fight cancer, though.

Okay, found it;


https://www.ncbi.nlm.nih.gov/pubmed/10050267



Of course this statement doesn't fill me with optimism about the competence of the research.