Neuroendocrine Tumour (NET) Dietary Management

Overview

Neuroendocrine tumours (NETs) are a heterogeneous group of cancers that arise from hormoneproducing cells of the gastrointestinal (GI) tract, pancreas, lungs and other sites. Because many NETs secrete active peptides and amines, the disease often presents with a range of metabolic and digestive disturbances. Nutrition therefore plays a central role in maintaining weight, managing symptoms, supporting treatment tolerance, and improving quality of life.

This page outlines evidencebased dietary strategies that can be adapted to the individual needs of people living with NETs. The recommendations are intended for use alongside medical advice from oncologists, gastroenterologists and dietitians.

Key Principles of NET Nutrition

• Maintain Adequate Energy Intake: Weight loss and cachexia are common, especially in advanced disease. Aim for 2530kcal/kg body weight per day, adjusting upward if you are losing weight.
• Prioritise HighQuality Protein: 1.21.5g protein per kilogram of body weight daily helps preserve lean muscle mass. Include lean meats, fish, eggs, dairy, legumes and soy.
• Control Carbohydrate Quality: Small, frequent meals with lowglycaemicindex carbs (e.g., whole grains, legumes, nonstarchy vegetables) stabilise blood glucose and reduce flushing episodes in serotoninsecreting tumours.
• Managing Fat Intake: Fatsoluble vitamins (A, D, E, K) are essential, but very highfat meals can exacerbate diarrhoea and malabsorption. Aim for 2030% of total calories from healthy fats (olive oil, avocado, nuts).
• Hydration: Diarrhoea, vomiting or steatorrhea increase fluid loss. Aim for at least 2L of fluid per day unless restricted by heart or kidney disease.
• Identify and Avoid Trigger Foods: Certain foods may provoke flushing, wheezing, cramping or diarrhoea. Keep a foodsymptom diary to pinpoint individual triggers.
• Tailor to Treatment Modality: Surgery, somatostatin analogues, PRRT, targeted therapies and chemotherapy each have specific nutritional sideeffects that require adjustments.

Meal Planning Strategies

Structure meals to minimise gastrointestinal burden while delivering balanced nutrition.

1. Small, Frequent Meals

Eat 56 modest portions a day (every 23hours). This reduces the volume of food entering the gut at any one time, limiting cramps, bloating and rapid hormone release.

2. The Plate Method

Half of each plate nonstarchy vegetables (broccoli, spinach, zucchini). Onequarter lean protein. Onequarter wholegrain carbohydrate or starchy veg (sweet potato, quinoa). Add a teaspoon of olive oil or a small handful of nuts for healthy fat.

3. LowFODMAP Adjustments

If you experience excessive gas, bloating or diarrhoea, trial a lowFODMAP approach for 24 weeks. Limit foods high in fermentable oligosaccharides, disaccharides, monosaccharides and polyols (e.g., onions, garlic, beans, certain fruits).

4. Enzyme Supplementation

For patients with pancreatic insufficiency (often after pancreatic NET surgery), prescribe pancreatic enzyme replacement therapy (PERT) at 30,00050,000IU lipase per main meal, taken with the first bite.

5. Managing Flushing Episodes

Flushing is frequently triggered by hot foods, caffeine, alcohol, chocolate and tyraminerich foods (aged cheese, cured meats). Reduce portion size, avoid very hot meals, and consider consuming meals at cooler temperatures.

Nutrition for Symptom Control

Diarrhoea

• Adopt a lowfat, lowfiber diet while you assess tolerance.
• Incorporate soluble fiber (psyllium husk, oatmeal) gradually it can bulk stool without worsening gas.
• Consider loperamide 2mg after each loose stool (max 16mg/24h) or diphenoxylateatropine as prescribed.
• Electrolyte replacement drinks with low sugar can prevent dehydration.

Constipation

• Increase fluid intake and dietary fibre (gradual introduction of whole grains, fruits, vegetables).
• Prunes, figs or a small daily spoonful of ground flaxseed can be helpful.
• Stool softeners (docusate) or osmotic laxatives (polyethylene glycol) may be required.

Abdominal Pain & Cramping

• Eat slowly, chew thoroughly and avoid large meals.
• Consider a bland diet (boiled potatoes, rice, toast) during flareups.
• Gastric acid suppression (PPIs) may aid if acid reflux contributes to pain.

Fat Malabsorption (Steatorrhoea)

Limit dietary fat to 20% of calories and use mediumchain triglyceride (MCT) oil as a supplemental energy source (MCTs are absorbed directly into the portal system, bypassing the need for pancreatic lipases).

Carcinoid Syndrome

In addition to medical therapy (octreotide, lanreotide), the following dietary tweaks help:

• Avoid alcohol, hot beverages, caffeine and spicy foods.
• Eat meals at moderate temperatures.
• Spread protein intake throughout the day rather than consuming a large proteinrich meal.

Supplements & Hydration

Supplements should complement, not replace, food. Discuss any additions with your healthcare team.

Vitamin & Mineral Needs

• Vitamin D: 8002000IU daily, especially if limited sun exposure or after resections affecting absorption.
• Calcium: 10001200mg per day from diet or calcium carbonate.
• Vitamin B12: Check levels if you have had gastrectomy or extensive smallbowel resection; oral or intramuscular replacement may be needed.
• Iron: Monitor ferritin and transferrin saturation; oral ferrous sulfate can be taken with vitamin C to improve absorption.

Probiotics

Strains such as Lactobacillusrhamnosus GG or Bifidobacteriumanimalis have modest evidence for reducing diarrhoea and abdominal discomfort. Use a daily dose of 10CFU after meals.

Omega3 Fatty Acids

EPA/DHA (2g total per day) may help with cachexia and inflammation. Plant sources (flaxseed oil) provide ALA but require conversion.

Fluid Recommendations

Include water, herbal teas, diluted fruit juices, and broth. During high diarrhoea periods, oral rehydration solutions containing sodium (90mmol/L) and glucose (111mmol/L) are preferred.

Practical Food List

Tip: Keep a simple spreadsheet with columns for Food, Portion, Time, Symptoms. Review weekly with your dietitian to refine your plan.