Having colon cancer resection in 4-5 weeks. is it ok and/or beneficial to add flax seed to diet while waiting. (ins. not effective until feb.)?

No difference: There would be no positive or negative benefit from using flax now, unless you are using it to treat a problem such as constipation. Your surgeon will likely prescribe laxatives and bowel prep to be used to cleanse the colon the day before surgery.

Flax seeds are good: Flax seeds are an excellent dietary supplement and can be eaten daily until the day or two before your bowel resection when you are on clear liquids for your bowel prep.