Maybe there are no specific studies on reoccurrence, but is quite likely that reoccurrence follows the same rules as primary cancer, and then it is reccommended to avoid meat and especially processed meat. Maybe once you have had cancer your odds are more dependent on other factors, but still it is worth to eat a plant based diet also because of sustainability.
Please share the links that you have from reputable sources that say NO red/processed meat for even primary cancer. EVERY study that I have seen with respect to this subject says to limit
red meat to approx. 18 - 20 ounces/week. I think people take this whole AVOID red meat to an extreme. It's just like everything else....MODERATION.
In addition, I don't think one can also state that there is a correlation between what may be recommended for primary cancer and that the same applies with respect towards recurrence. One could argue that, in my case, my diet was a potential factor in my diagnosis. I have no family history of colorectal cancer so rule that one out. I don't drink, don't smoke but am not physically active and I regularly ate red meat 3-4 times a week. Honestly, haven't changed my diet with respect to meat since diagnosis and I'm 12 years out from that date and 11+ years out from my last treatment. I still don't drink or smoke and am not particularly physically active. Has my diet changed? Absolutely not. What HAS changed is that I am more cognizant of the fact that MY body tends to be a particularly welcoming host for colorectal polyps and probably always will be. I don't particularly like a 'plant based diet' and refuse to follow it. Sure, I eat my veggies and fruit but certainly not as much as most diets recommend and no way am I near even a partial plant based diet.
We need to be careful about making comments that we can make a huge difference in recurrence rates if we only follow a plant based diet and/or get more exercise. Sure, eating a better diet and eating unhealthy things (high fat meats, processed meats) in moderation and getting more exercise are all good things but to imply that avoiding red and/or processed meat and being more physically active will somehow stop a person from a recurrence is, IMO, irresponsible and unfair. Each person has to decide for him/herself what he/she is willing to do/not do with respect to lifestyle changes.....particularly after having gone through cancer. What's the right choice for one person isn't necessarily the right choice for another.