You take your enzymes with every meal like you were told. And yet the stools are pale, greasy, hard to flush, and the weight is drifting down. That gap between “I am taking PERT” and “my body still is not absorbing fat” is one of the most confusing parts of this illness. Let me walk through what is happening, how it is confirmed, and how to fix a dose that is not working.
The condition has a name: exocrine pancreatic insufficiency, EPI. It means the pancreas is not putting out enough digestive enzymes to break down your food, fat especially. A 2026 meta-analysis put it at about 40 percent of people with chronic pancreatitis, anywhere from 21 to 52 percent depending on which test was used (I went through the three tests here), so your own status should be confirmed by testing rather than assumed.
How it is confirmed. The usual first test is faecal elastase-1, a simple stool test. A result under 200 micrograms per gram suggests EPI, and under 100 suggests it is severe. It is not perfect, a very watery sample can throw it off, but it is the practical starting point, and it is worth asking for by name if you have the symptoms and have not been tested.
The signs worth knowing. Pale, oily, floating, foul-smelling stools that are hard to flush are the classic one, called steatorrhoea, and it is fat passing through undigested. Weight loss you did not intend. Bloating, gas and cramping after meals. And the slower, quieter signs of missing the fat-soluble vitamins, A, D, E and K, which need fat to be absorbed, plus the bone-thinning that can follow low vitamin D over time. If fat is not getting in, those vitamins are not either, which is why your team checks them and may check a bone density (DXA) scan.
Now the part people miss: if you have these signs while already on enzymes, that usually does not mean the enzymes have failed. It much more often means the dose, the timing, or the conditions are not right.
The common fixes, to raise with your team. Dose: a frequent reason for failure is simply too low a dose. Typical adult dosing is in the region of 40,000 to 50,000 lipase units with a main meal and roughly half that with a snack, titrated up by your team to control symptoms, but many people are quietly under-dosed below this. Timing: enzymes work best taken with and through the meal, spread across a longer meal rather than all swallowed at the start or, worse, after you have finished. Acid: stomach acid can stop some enzymes working, which is why a doctor may add an acid-reducing medicine such as a proton pump inhibitor to let the PERT do its job. And snacks count: a snack with fat needs enzymes too, not just the main meals.
Stepan’s Rule: Greasy stools while on PERT is not a verdict, it is a message. The message is almost always “raise the dose, fix the timing, or add acid control,” not “give up.” Ask for a faecal elastase test if no one has tested you, then troubleshoot the dose properly.
What not to do is suffer in silence and assume this is just how it is now. EPI that is properly dosed and monitored is manageable. EPI that is under-treated quietly costs you weight, strength, vitamins and bone, none of which you can spare.
The full how-to on taking enzymes, timing them across a meal, and working with your team on dose is in the book, written the way I wish someone had written it for me at the start.
Patient experience, not medical advice. EPI is diagnosed, dosed and monitored by your medical team.