Table 1 Inclusion and exclusion criteria

Inclusion criteria

Primary adenocarsinoma colorectal cancer (ICD-10 C18-C20):

C18 Malignant neoplasm of colon

C18.0 Caecum

C18.1 Appendix

C18.2 Ascending colon

C18.3 Hepatic flexure

C18.4 Transverse colon

C18.5 Splenic flexure

C18.6 Descending colon

C18.7 Sigmoid colon (sigmoid (flexure)

C18.8 Overlapping lesion of colon

C18.9 Colon, unspecified

C19 Malignant neoplasm of rectosigmoid junction

C20 Malignant neoplasm of rectum

TNM stage I-III

Age 50–80 years old

Exclusion criteria

Colorectal adenoma, carcinoid, abdominal carcinomatosis or sarcoma

Unable to read and understand Norwegian

Unable to perceive information and understand the intervention as such due to dementia or altered mental status

Unable to follow the dietary intervention due to medical/clinical conditions e.g. total parental nutrition, permanently institutionalized

Participation in another study in conflict with the intention of the CRC-NORDIET study