Glad you’re feeling better, but you could have just stopped at increase fiber intake and decrease red meat and alcohol consumption. None of the rest is linked to colorectal cancer, certainly not mayonaise, which is just oil and egg.

I've explained why I don't have mayonnaise. Also it was just an example. I avoid it because I can eat more meaningful stuff without bombing my calories and saturated fats stats. The mayonnaise I find in the shops has terrible composition.