When people struggle to gain weight despite eating well, modern medicine often evaluates whether their digestive enzymes are functioning adequately. While the Donguibogam portrays the small intestine as a dedicated chef, modern medicine identifies the pancreas as the primary partner in this digestive process. Beyond its endocrine function of secreting insulin to regulate blood glucose, the pancreas carries out an exocrine function by secreting substantial volumes of digestive enzymes essential for processing food.
Food broken down in the stomach descends into the small intestine, where pancreatic enzymes—such as amylase for carbohydrate digestion, protease for proteolysis, and lipase for lipolysis—break nutrients down into units small enough for absorption. Fat digestion, in particular, is virtually impossible without lipase. When the pancreas cannot produce an adequate supply of these enzymes, the condition is known as exocrine pancreatic insufficiency.
An enzyme deficiency affects fat digestion most severely. Undigested fats irritate the small intestinal mucosa and draw in water, leading to frequent loose stools or characteristic steatorrhea. Steatorrhea contains excess fat, which can cause stool to float, coat the porcelain, or feel greasy and difficult to clean. Stools may also appear pale yellow or grayish. Because dietary fat is a vital energy source and is necessary for absorbing fat-soluble vitamins such as vitamins A, D, E, and K, impaired fat digestion can lead to weight loss from calorie deficit as well as nyctalopia, osteoporosis, easy bruising, or hemorrhage. This can ultimately progress to generalized malnutrition.
The causes of pancreatic enzyme deficiency vary. It can stem from intrinsic conditions such as chronic pancreatitis or pancreatic cancer, cystic fibrosis, sequelae following gastric or pancreatic surgery, certain autoimmune diseases, or complications of diabetes. Pancreatic function can also decline naturally with advancing age. If these symptoms continue, it is advisable not to dismiss them as an inherently lean constitution, but to visit a clinic for a stool examination or pancreatic function test. When indicated, pancreatic enzyme replacement therapy can meaningfully improve quality of life. Attending to these digestive signals protects the foundational health of the body.
