Inclusion Criteria:  Patients over 18 years of age Able to tolerate oral diet  Confirmed diagnosis of SBO due to underlying malignancy to include:  Patients with colorectal or gynaecological cancers with primary or secondary tumour in situ, undergoing cancer treatment or supportive care. Patients diagnosed with advanced inoperable cancers of colorectal or gynaecological origin Presenting in outpatient clinics or admitted from A&E with a minimum of 2 symptoms of SBO including: abdominal pain, bloating after eating, early satiety, nausea, vomiting Capacity to give informed consent  Exclusion Criteria:  Patients under 18 years of age No symptoms of bowel obstruction Have not already been given advice to follow the 4 stage bowel obstruction diet Unable to tolerate oral diet i.e. enterally or parenterally fed Unable to provide capacity to give informed consent Unable to read and communicate in the English language