I’m sorry to hear about your father. I’m glad that he’s still here and that they were able to do something about. If I can suggest any changes to your diet, make sure that you have adequate fiber consumption. The weak association with colon cancer that is found with red meat consumption seems to be negated by adequate fiber consumption in studies.

And of course processed meats like lunch meat have clear association as carcinogens, like lunch meats, bacon, some sausages etc, so if you’re willing to cut them out that’s great! And the fact that you feel better if even better even if it isn’t due to cutting it. Do what feels best for you. If you’re a healthy individual, I wouldn’t be too scared of unprocessed lean cuts of red meat if you tolerate it okay. Always be sure to get your levels checked regularly, I believe every 5 years is what recommended but I try to go in once a year.