Inclusion Criteria:

- NET confirmed by histology

- Diarrhea, (at least 3 loose or watery bowel movements per day) as part of carcinoid
syndrome.

- Newly referred patients without previous somatostatin analogue treatment or

- NET patients who are pausing somatostatin analogue treatment due to other treatment
or examination.

Exclusion Criteria:

- Subjects unable to understand the information

- Severe diabetes with late complications or known metabolic disorder

- Inflammatory bowel disease

- Known clinically significant stenosis of the bowel

- Bile acid malabsorption due to intestinal surgery

- Small bowl bacterial overgrowth