Short Gut Syndrome

What short gut syndrome is

The small intestine is normally about 3 to 8 m (10 to 26 ft) long in adults. It has three parts: the duodenum, jejunum and ileum. Most nutrients are absorbed in the jejunum. The ileum absorbs vitamin B12 and bile acids and slows the passage of food. The colon absorbs water and salt and can salvage energy from undigested carbohydrate.

Short gut syndrome develops when so much bowel is lost that you cannot absorb enough fluid, calories or nutrients. How severe it is depends on:

• How much small bowel remains: under about 100 cm with an end stoma, or under 50 to 60 cm with the colon connected, usually means long-term IV support.
• Which parts remain: losing the ileum is harder to compensate for than losing the jejunum.
• Whether the colon is still connected: a working colon greatly improves fluid absorption and energy.
• Whether the ileocecal valve remains.
• Health of the remaining bowel.

For a broader explanation of the condition, see short bowel syndrome. This page focuses on diet, adaptation and day-to-day management.

Anatomical types

Causes

In adults:

• Repeated surgery for Crohn's disease.
• Loss of blood supply to the bowel (mesenteric ischemia) from a clot.
• Twisting of the bowel (volvulus).
• Trauma.
• Cancer surgery and radiation damage.
• Complications after bariatric or abdominal surgery.

In babies and children:

• Necrotizing enterocolitis in premature infants.
• Birth defects such as gastroschisis, intestinal atresia and malrotation with volvulus.

Symptoms

• Diarrhea or high stoma output, often watery and worse after eating.
• Dehydration and thirst.
• Weight loss and muscle wasting.
• Fatigue and weakness.
• Bloating, cramping and gas.
• Fatty, foul-smelling stools.
• Deficiency symptoms: muscle cramps (magnesium, calcium), numbness (B12), night-vision problems (vitamin A), bone pain (vitamin D), easy bruising (vitamin K), skin rashes (zinc).
• In children, poor growth.

Intestinal adaptation

After surgery, the remaining bowel begins to adapt. The lining grows, the villi lengthen, and the bowel can widen and slow down. This improves absorption over 1 to 2 years, sometimes longer in children. Eating by mouth or tube feeding is the strongest stimulus, so even people on IV nutrition are encouraged to eat.

Short gut syndrome diet

Diet depends heavily on whether you have a colon. A dietitian experienced in intestinal failure is essential.

If your colon is connected

• Eat small, frequent meals (5 to 6 a day).
• Focus on complex carbohydrates (bread, rice, pasta, potatoes), which the colon can convert into energy.
• Keep fat moderate, because unabsorbed fat causes diarrhea and binds calcium.
• Limit oxalate (spinach, rhubarb, beets, nuts, chocolate, tea), because people with a colon absorb extra oxalate and develop kidney stones.
• Soluble fiber can thicken stool.

If you have an end jejunostomy (no colon)

• Fat is better tolerated than with a colon and is a useful source of calories.
• Restrict plain water, tea, coffee and other low-salt drinks to about 500 to 1,000 ml a day, because they draw salt out of the body and increase stoma output.
• Drink oral rehydration solution (ORS) with a high sodium content (about 90 mmol/L), such as the St Mark's formula, sipped through the day.
• Add salt to food.

For everyone

• Separate liquids from meals by about 30 minutes.
• Limit simple sugars and sugary drinks, which pull water into the bowel.
• Chew food well.
• Take prescribed vitamins and minerals.

Medical treatment

• Antidiarrheals: loperamide (often at higher than standard doses under medical supervision) and codeine slow the bowel.
• Acid reducers: proton pump inhibitors reduce the excess stomach acid that follows bowel removal, especially in the first months.
• Bile acid binders: for diarrhea after ileal loss when the colon is present, used carefully.
• Antibiotics: for small intestinal bacterial overgrowth.
• Vitamin and mineral replacement: including B12 injections if the ileum was removed, and magnesium.
• GLP-2 analogs: teduglutide, a daily injection that promotes bowel growth, reduces the need for IV nutrition in many patients and allows some to stop it. Longer-acting versions are in development.
• Pancreatic enzymes occasionally.

IV nutrition (parenteral nutrition)

When the bowel cannot absorb enough, nutrition is given directly into a vein through a central line, often overnight at home. Home parenteral nutrition allows people to live and work normally, but it carries risks:

• Central line infections and blood clots.
• Liver disease associated with intestinal failure.
• Bone thinning.

Specialist intestinal failure teams aim to reduce IV support as adaptation progresses.

Surgery

• Restoring continuity: reconnecting the colon when possible improves absorption.
• Bowel lengthening procedures (such as STEP or the Bianchi procedure), mainly in children with widened bowel.
• Intestinal transplant: for people with life-threatening complications of IV nutrition or loss of vein access.

Complications

• Dehydration and kidney damage.
• Kidney stones (calcium oxalate) and gallstones.
• D-lactic acidosis, causing confusion and slurred speech after carbohydrate loads.
• Bacterial overgrowth.
• Metabolic bone disease.
• Liver disease.
• Deficiencies, including vitamin B12 deficiency.

Outlook

Outlook has improved greatly. Many adults eventually reduce or stop IV nutrition within 2 to 3 years, especially with a colon in continuity and over 60 cm of small bowel. Long-term survival on home parenteral nutrition is good, with most deaths related to the underlying disease. Children with short gut syndrome often achieve full enteral feeding as they grow.

Frequently asked questions

What is short gut syndrome?

Short gut syndrome is a condition where too much small intestine has been removed or damaged to absorb enough water, calories, vitamins and minerals. It most often follows surgery for Crohn's disease, loss of blood supply to the bowel, or birth defects and necrotizing enterocolitis in babies.

What can you eat with short gut syndrome?

It depends on your anatomy. With a colon, eat small frequent meals rich in complex carbohydrates, moderate fat and low oxalate. Without a colon, limit plain water, sip high-sodium oral rehydration solution and add salt. Everyone should limit sugary drinks and separate liquids from meals.

Can the small intestine grow back?

It does not regrow its lost length, but the remaining bowel adapts. Its lining thickens, the absorbing villi lengthen and the bowel can widen, which improves absorption over 1 to 2 years. Eating and GLP-2 medicines such as teduglutide help this process.

What is the life expectancy with short gut syndrome?

Many people with short gut syndrome live for decades, especially with good specialist care. Survival depends on the underlying cause, the length of remaining bowel and complications of IV nutrition such as line infections and liver disease. Those who wean off IV nutrition generally do best.

How is short gut syndrome different from short bowel syndrome?

They are the same condition. "Short gut syndrome" and "short bowel syndrome" are used interchangeably. When the bowel cannot absorb enough without IV fluids or nutrition, doctors also use the term intestinal failure.