Abstract
Diabetic diarrhea and steatorrhea occur predominantly in young adult males who have juvenile-onset diabetes mellitus complicated by neuropathy. The presentation is often severe, with nocturnal or postprandial watery diarrhea and tenesmus. Massive malabsorption of fat may occur; however, malabsorption of other nutrients and generalized wasting are quite rare. Because the symptoms are relatively refractory to treatment, it is important to rule out other, more easily treatable causes of this presentation. Bacterial overgrowth, exocrine pancreatic insufficiency, and celiac disease are also associated with diabetes mellitus and can mimic this process. Although the mechanism of diabetic diarrhea and steatorrhea remains unclear, neuropathy, gastrointestinal motor abnormalities, bacterial overgrowth, and bile acid abnormalities have been implicated in the pathogenesis.
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