Exocrine Pancreatic Insufficiency (EPI)

What EPI is

The pancreas has two jobs. Its endocrine part makes insulin and other hormones. Its exocrine part makes digestive juice containing enzymes: lipase to digest fat, protease to digest protein and amylase to digest starch. This juice flows into the small intestine through the pancreatic duct.

In EPI, enzyme output falls or the duct is blocked. The pancreas has a large reserve, so obvious fatty stools usually appear only once enzyme output falls below about 10% of normal. Fat digestion suffers first and most, because lipase is the enzyme most dependent on the pancreas. Undigested fat passes into the stool and carries fat-soluble vitamins (A, D, E and K) with it.

Symptoms

• Steatorrhea: pale or clay-colored, bulky, greasy stools with a very strong smell, that float, stick to the bowl or leave an oily film
• diarrhea or frequent loose stools, often after meals
• bloating, gas and abdominal cramps
• unintended weight loss despite eating normally
• tiredness and muscle loss

Signs of vitamin deficiencies:

• vitamin A: poor night vision and dry eyes
• vitamin D: weak bones, osteoporosis and fractures
• vitamin E: numbness and unsteady walking
• vitamin K: easy bruising and bleeding

Mild EPI may cause only vague bloating and loose stools, which can be mistaken for irritable bowel syndrome.

Causes and risk factors

Pancreatic damage or blockage

• Chronic pancreatitis: the most common cause in adults, often from long-term heavy alcohol use and smoking. Many people develop EPI 5 to 10 years after diagnosis.
• Cystic fibrosis: the most common cause in children. Most people with CF have EPI from birth.
• Pancreatic cancer: tumors can block the pancreatic duct.
• Pancreatic surgery: such as the Whipple procedure or removal of part of the pancreas.
• Severe acute pancreatitis that destroyed pancreatic tissue.
• Rare genetic conditions such as Shwachman-Diamond syndrome.

Conditions linked with EPI

• type 1 and type 2 diabetes, especially long-standing
• celiac disease and inflammatory bowel disease
• stomach surgery and weight-loss surgery, which disrupt how food and enzymes mix
• older age

How EPI is diagnosed

• Fecal elastase-1 test: a single stool sample measures an enzyme that passes through the gut intact. Below 200 µg/g suggests EPI, and below 100 µg/g indicates severe EPI. Very watery stool can give a falsely low result.
• Blood tests: fat-soluble vitamins, nutritional markers, blood sugar and HbA1c.
• Imaging: CT or MRI (often MRCP) to look for chronic pancreatitis, calcium deposits, duct changes or a tumor. Endoscopic ultrasound gives detailed images.
• Response to treatment: improvement with enzymes supports the diagnosis.

Doctors also consider conditions that cause similar symptoms, including celiac disease, small intestinal bacterial overgrowth, bile acid diarrhea and inflammatory bowel disease.

Treatment

Pancreatic enzyme replacement therapy (PERT)

PERT capsules contain pancrelipase, a mix of lipase, protease and amylase from pig pancreas. Brand names include Creon, Zenpep, Pancreaze, Pertzye and Viokace. Your doctor sets the dose based on lipase units, your weight and the fat in your meals.

How to take enzymes for best results:

• Take them with the first bite of every meal and every snack that contains fat or protein. With long meals, take part of the dose halfway through.
• Swallow capsules whole. Do not crush or chew them. If needed, they can be opened and the beads sprinkled on a small amount of acidic soft food such as applesauce, then swallowed without chewing.
• Do not take them with plain fruit, sugary drinks or fat-free foods unless advised.
• Store them at room temperature, away from heat.
• Doses are increased if symptoms persist. If enzymes still do not work well, an acid-reducing medicine can help protect them from stomach acid.

Diet

• Eat a normal, balanced diet with healthy fats, adjusting enzymes rather than cutting fat. Very low-fat diets worsen malnutrition.
• Smaller, more frequent meals can help.
• Avoid alcohol and stop smoking, which both damage the pancreas further.
• A dietitian experienced in pancreatic disease is very helpful.

Vitamins and bone health

Supplements of vitamins A, D, E and K are often needed, guided by blood levels. Bone density scans check for osteoporosis.

Treating the cause

This may include managing chronic pancreatitis pain, treating diabetes, CF-specific treatments, or cancer care.

Complications

Untreated EPI can lead to malnutrition, muscle loss, vitamin deficiencies, osteoporosis and fractures, and poor quality of life. In chronic pancreatitis, undertreated EPI is linked with higher rates of complications and death, which is why enzyme treatment matters even when symptoms seem mild.

Frequently asked questions

What does EPI stool look like?

EPI stools are often pale or clay-colored, bulky, greasy and very foul-smelling. They may float, be hard to flush, or leave an oily film or droplets of oil in the toilet. Some people instead have loose, frequent stools without obvious oil.

What is a normal fecal elastase level?

A fecal elastase above 200 µg/g of stool is generally normal. A level between 100 and 200 suggests mild to moderate EPI, and below 100 suggests severe EPI. Watery stool can dilute the sample and give a falsely low result, so results are interpreted alongside symptoms.

Can exocrine pancreatic insufficiency be cured?

Usually it cannot be cured, because the pancreatic damage is permanent. It is controlled very effectively with enzyme replacement therapy, taken with meals for life. When EPI is caused by a treatable blockage, such as a stone or tumor, function can sometimes improve.

What should you not eat with pancreatic insufficiency?

There is no need to avoid fat completely. The aim is to match enzymes to meals. Avoid alcohol, and be cautious with very large, heavy meals, which are harder to cover with enzymes. Spreading food into smaller meals and snacks, each taken with enzymes, usually works best.

What happens if EPI is left untreated?

Without treatment, people lose weight and muscle, develop deficiencies of vitamins A, D, E and K, and are at risk of osteoporosis, fractures, bleeding problems and nerve damage. Ongoing digestive symptoms also reduce quality of life. Enzyme therapy prevents most of these problems.