Patients with Crohn’s disease may exhibit reduced pancreatic digestive activity. A study published in Gut (1990;31:1076–1079) compared pancreatic enzyme function in individuals with Crohn’s disease and healthy controls. The researchers measured the activity of amylase and lipase—enzymes responsible for digesting carbohydrates and fats, respectively.
The study included 59 men and 84 women with Crohn’s disease and compared them with 50 men and 65 women without the condition. Individuals with Crohn’s disease showed significantly lower pancreatic enzyme activity than controls, with the lowest levels observed in those with the most extensive bowel involvement. This finding suggests that impaired digestion may accompany more advanced disease.
Dietary patterns have also been explored in relation to Crohn’s disease. Several studies have reported that patients with Crohn’s disease tended to consume higher amounts of refined sugar prior to diagnosis. Research published in the Scandinavian Journal of Gastroenterology (1983;18:999–1002), Epidemiology (1992;3(1):47–52), and the British Medical Journal (1979;2:762–764) all reported associations between refined sugar intake and Crohn’s disease risk.
In addition, a small dietary intervention study published in Z Gastroenterologie (1981;19(1):1–12) compared Crohn’s disease patients following a low-carbohydrate, sugar-free diet with those consuming a high-carbohydrate diet. Approximately 80% of patients in the low-carbohydrate group experienced symptom improvement, while four of the five patients in the high-carbohydrate group were withdrawn from the study due to symptom exacerbation.
These findings align with the hypothesis proposed by Elaine Gottschall, who suggested that Crohn’s disease may involve an impaired ability to digest complex carbohydrates. According to this model, undigested carbohydrates are fermented by intestinal bacteria, leading to irritation of the intestinal lining and further impairment of digestive capacity. This concept is described in detail in her book Ending the Vicious Cycle, which outlines a dietary approach eliminating disaccharides and complex carbohydrates.
While these studies do not establish causation, they suggest that digestive enzyme function and carbohydrate handling may be relevant factors in the symptom patterns observed in Crohn’s disease, and they continue to inform ongoing discussion about diet–gut interactions in inflammatory bowel disorders.
