Increase in inflammatory bowel disease in developing world predicted

"Over the past 100 years, the incidence of IBD in western countries has climbed and then plateaued," says Kaplan, an associate professor at the Cumming School of Medicine. "Our research shows that countries outside the western world now appear to be in the first stage of this sequence."

IBD affects over 0.3 per cent of the population in North America and Europe, with more than 200,000 patients afflicted in Canada. "IBD is a modern disease, growing in prevalence in North America, Europe and Australia since the 1950s," says Kaplan. "As countries in Asia, South America and the Middle East have become industrialized, IBD has emerged and its incidence is rising dramatically. At the turn of the 21st century, it became a global disease."

Done in collaboration with Siew Ng, PhD, at the Chinese University of Hong Kong, the research brings together data from all population-based studies reporting on the incidence or prevalence of IBD since 1990. "As newly industrialized countries become more westernized, we can clearly see that the incidence of IBD is also rapidly rising," says Ng.

As IBD becomes a global problem, Kaplan and Ng are hopeful that a co-ordinated solution to prevent and treat IBD around the world could be possible. "Future research should focus on identifying environmental risk factors observed during the early stages of industrialization," says Ng. Kaplan agrees, saying, "Research into environmental intervention that helps to prevent IBD should be prioritized."

Kaplan is presenting the findings at the World Congress of Gastroenterology Oct. 16 in Orlando, Fla. "The increasing prevalence of IBD will challenge clinicians and health policy-makers," says Kaplan. "Globally, we need to prepare our clinical infrastructure and personnel to manage this complex and costly disease."

Gilaad Kaplan, MD, PhD, is an associate professor in the departments of medicine and community health sciences at the Cumming School of Medicine, as well as a CIHR Embedded Clinician Research Chair. He is the scientific director of the Digestive Health Strategic Clinical Network, Alberta Health Services. He is a member of the O'Brien Institute for Public Health and the Snyder Institute for Chronic Diseases.