When Eating Isn’t Enough to Get the Nutrients You Need

When you have pancreatic cancer, digestion often takes a hit.

Even if you’re doing all the right things—eating nutrient-rich foods, prioritizing protein, monitoring fiber and fat, and taking pancreatic enzymes—the number on the scale may continue to fall. In many cases, the problem isn’t what you’re eating. It’s what your body is absorbing.

“Depending on where the cancer is located, food may move through the gastrointestinal tract too quickly, or without sufficient enzymes for digestion and absorption,” explains Peter Adintori, M.S., R.D.-A.P., C.S.O., C.D.N., C.N.S.C., Outpatient Oncology Dietitian at Mount Sinai Queens Cancer  (Astoria, New  York).

The Role of the Pancreas in Digestion

The pancreas plays a critical role in digestion by producing the enzymes needed to break food down into absorbable nutrients. Unfortunately, pancreatic cancer often interferes with enzyme production or delivery.

“The head of the pancreas empties into the duodenum, which is where much of digestion begins,” Adintori says. “Tumors in the head of the pancreas tend to be the hardest on blood sugar, appetite, and overall digestive function.” 

Help me find a pancreatic cancer expert near me.

Learn more

When enzymes aren’t available in the right place at the right time, fats pass through the digestive tract undigested, calories are lost in the stool, essential vitamins are not absorbed, and weight loss continues, despite adequate intake. The end result: exocrine pancreatic insufficiency (EPI), a condition that is both common and undertreated. 

Signs You Need Digestive Support

EPI doesn’t always look dramatic. That’s why it’s so easy to miss. But when digestion is compromised, there are telltale signs:

• Oily, greasy, or floating stools
• Persistent diarrhea
• Bloating and cramping after meals
• Feeling full quickly
• Ongoing, unexplained weight loss

“If you’re eating consistently throughout the day but still losing weight, it’s time to look beyond intake and start examining absorption,” Adintori notes. 

Why Nutrients Aren’t “Sticking”—and What to Do About It

Solving inadequate absorption requires a practical, bite-by-bite approach to solving four key digestive dilemmas:

1. Insufficient pancreatic enzymes: For most patients with EPI, the first line of defense is pancreatic enzyme replacement therapy, or PERT, which aims to replace the enzymes the pancreas can no longer provide.
   The fix: “Work with your doctor or a registered dietitian to find the correct dosing,” says Adintori. In general, you should take enzymes at the beginning of every meal and snack, and dosing should match the meal. The success of enzymes depends on the fat content of the meal. Higher fat meals require more enzymes or a higher overall dose of lipase, the enzyme that helps digest fat.
2. Rapid gastric emptying (dumping): For some pancreatic cancer patients, food may pass through the stomach and gastrointestinal (GI) tract too quickly. The end result: diarrhea, weakness, and further weight loss. 
   The fix: Smaller, more frequent meals and adjustments in food composition can help slow digestion and improve nutrient uptake. Pairing carbohydrates with protein or fat and limiting concentrated sugars may help slow digestion. Your provider may also recommend medications to regulate motility. Including soluble fiber-rich foods can also promote slowing of food through the body.
3. Bile Acid Diarrhea: When food moves too quickly through the gut, bile acids can reach the rectum at higher levels, irritating the bowel and causing diarrhea—even when enzymes are working properly. You’ll know that bile acid diarrhea is a potential issue if you feel a burning sensation during bowel movements.
   The fix: Certain medications, such as cholestyramine or colesevelam, can bind excess bile acids and reduce symptoms. Bile acid issues are treatable when properly diagnosed.
4. Balancing Fat and Fiber: Fat is packed with calories, which can help with weight maintenance, but it’s also the most difficult macronutrient to absorb without adequate enzymes. Too much fiber can be problematic, too, since it can lead to fullness, bloating, and nausea.
   The fix: This is a tricky area that requires expert guidance, not broad restrictions or prescriptions. In some cases, the fix is simple: Modifying PERT. In others, clinicians need to devise a tailored treatment approach.

A Gentle, Practical Approach to Eating

Eating nourishing food is essential when you have pancreatic cancer. Instead of following rigid rules or elimination diets, Adintori practices something called “gentle nutrition.”

“With gentle nutrition, we focus on what feels most stressful and complicated about eating and address that first,” he explains. “When food becomes associated with fear—fear of symptoms, fear of weight loss, fear of doing something wrong—it can create negative psychological connotations that make eating even harder.”

Gentle nutrition shifts the focus from perfection to progress by implementing simple strategies:

• Eat small, frequent meals throughout the day instead of a few large ones.
• Prioritize protein and calorie-dense foods. Even if your appetite is low, focus on meals and snacks that pack both protein and calories.
• Take pancreatic enzymes as prescribed—with every meal and snack. If symptoms persist, talk to a registered dietitian, or your oncologist, about dosing adjustments.
• Keep a simple log of meals, enzyme timing, and digestive patterns, to the degree that you’re able, to help your care team identify patterns and needed adjustments.
• Consider medication. Bile acid sequestrants (BAS) and motility modifiers can be game- changers if you’re experiencing troubling GI symptoms.

Pancreatic cancer changes digestion. But with the right strategies, patients can improve nutrient absorption, stabilize weight, and feel more like themselves while navigating the disease.

“Nutrition isn’t just about eating more,” Adintori says. “It’s also making sure what you eat becomes fuel for your body.”

When absorption improves, energy often follows—and that can make a meaningful difference in quality of life during treatment.