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Celiac Disease on the Rise in U.S. - from sanitation and hygiene?
      08/24/11 02:41 PM
HeatherAdministrator

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Celiac Disease on the Rise in U.S.

Speculation on increase in digestive disorder centers on improvements in sanitation and hygiene

By Dennis Thompson
HealthDay Reporter

FRIDAY, Aug. 19 (HealthDay News) -- Complaints of celiac disease are on the rise in the United States, with more and more people growing ill from exposure to products containing gluten.

Nearly five times as many people have celiac disease today than did during the 1950s, according to one recent study. Another report found that the rate of celiac disease has doubled every 15 years since 1974 and is now believed to affect one in every 133 U.S. residents.

"It's quite widespread," said Dr. Alessio Fasano, director of the Center for Celiac Research and the Mucosal Biology Research Center at the University of Maryland School of Medicine. "We thought there were regional differences in the past, but now we know it's everywhere."

That increased incidence rate has left researchers scrambling to figure out why more people are developing the chronic digestive disorder. Doctors still can't explain the trend, but they are making some headway testing a number of hypotheses.

"There are many theories out there, not all independent of each other and not all of them true," Fasano said.

Celiac disease is an inherited autoimmune disorder that causes the body's immune system to attack the small intestine, according to the U.S. National Institutes of Health and the University of Chicago Celiac Disease Center. The attack is prompted by exposure to gluten, a protein found in such grains as wheat, rye and barley.

The disease interferes with proper digestion and, in children, prompts symptoms that include bloating, vomiting, diarrhea or constipation. Adults with celiac disease are less likely to show digestive symptoms but will develop problems such as anemia, fatigue, osteoporosis or arthritis as the disorder robs their bodies of vital nutrients.

Awareness of celiac disease has grown in recent years, evidenced by the growing number of gluten-free foods on the market. However, medical experts don't believe that the increase in celiac disease incidence can be chalked up simply to folks becoming more aware of the chronic digestive disorder or to improvements in diagnostic techniques.

Rather, the most popular potential explanations for the increase in celiac disease rates involve improvements in sanitation and hygiene in civilization overall, said Fasano and Carol McCarthy Shilson, executive director of the University of Chicago Celiac Disease Center.

According to the "hygiene hypothesis," Shilson said, people in industrialized countries are more at risk for celiac disease because their bodies have not had to fight off as many diseases.

"We're just too clean a society, so our immune systems aren't as developed as they should be," she said.

Another version of the hypothesis holds that the cleanliness of industrialized society has caused a fundamental change in the composition of the digestive bacteria contained within the gut, Fasano said.

"It's because this increase occurs primarily in industrialized countries, where things are cleaner," Fasano said. "We abuse antibiotics, we wash our hands too often, we are vaccinated more often."

Other potential explanations for the rise in celiac disease rates, according to Fasano, include:

An increase in the amount of gluten found in grains. "We eat grains that are much more rich in glutens than they were 70 or 80 years ago," he said.
Children being exposed to gluten from an early age. "We know for sure if we introduce grains too early, people at risk for developing celiac disease are more likely to contract it," he said.
Too few women breast-feeding their children. "There are theories out there that say breast-feeding will protect you, or prevent celiac disease," Fasano said.

It's possible, experts say, that each of these theories is correct to a degree and that a combination of factors will ultimately be found to contribute to celiac disease. "It may well be in one person, one plays a stronger role than another," Fasano said.

But while experts try to find a cause -- and then, they hope, a cure -- advocates urge people who are at risk for developing celiac disease to undergo screening for the disorder.

Researchers have shown a genetic predisposition for celiac disease, with about 30 percent of the population carrying genes that make them vulnerable, Shilson said.

But because adults with celiac disease often don't suffer the digestive symptoms associated with gluten intolerance, many people are unaware they have it or could pass it on. "About two-thirds of people with the active disease have no symptoms at all," Shilson said.

Studies also have found that the earlier people find out they have celiac disease, the better able they are to head off the disorder's more debilitating effects.

"There's not much you can do to prevent it, but you can be aware of it and catch it," Shilson said. "Early intervention is key."

However, people who suspect they have celiac disease should not go gluten-free before being tested. Doing that can interfere with the accuracy of the screening.

"It's very important that you don't change your diet before you are screened for celiac disease," Shilson said.

More information

To learn more about celiac disease, visit the Celiac Sprue Association.

SOURCES: Alessio Fasano, m.d., director of the Center for Celiac Research and the Mucosal Biology Research Center at the University of Maryland School of Medicine; Carol McCarthy Shilson, executive director, University of Chicago Celiac Disease Center

Last Updated: Aug. 19, 2011

Copyright © 2011 HealthDay. All rights reserved.

http://consumer.healthday.com/Article.asp?AID=651247

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