Good morning @starko. I agree, good nutrition is essential for staying healthy, recovering from an illness and supporting a healthy life style. Unfortunately the human body and cancer are very, very complex and there just isn't research to that says definitely that diet, rest, good nutrition and exercise will stave off further cancer, or even cause it. Definitely there are some foods that can cause inflammation, which is unhealthy for many people in a ton of different ways. Inflammation might or might not cause cancer or a recurrence. And not everyone responds to every food in the same way.
I asked my doctor if there was a diet that prevents cancer or recurrences and he said that if there were there would be a lot more people with less cancers.
Here is a list of foods that have shown inflammation.
https://www.healthline.com/nutrition/6-foods-that-cause-inflammatione
Does this make sense?