More than half of gluten-free pizza and pasta dishes in restaurants tested positive for the presence of gluten, according to a study recently published on the American Journal of Gastroenterology website.
In addition,researchers found that about one-third of supposedly gluten-free foods had detectable gluten—but that might be due to cross-contamination, said lead author Dr. Benjamin Lebwohl, who practices at the Celiac Disease Center at New York-Presbyterian Hospital and is an assistant professor of medicine and epidemiology at Columbia Mailman School of Public Health.
“The solution may be better education for food preparers,” he said in a prepared statement released by Columbia Mailman School.
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Approximately 1% of Americans have celiac disease, an autoimmune disorder that causes bloating, constipation and pain in the small intestine, as well as other systemic issue. The main treatment for the disorder is to avoid foods that contain gluten, such as cereals, breads and pasta.
“Patients have long suspected that gluten contamination in restaurant foods is a frequent occurrence, and these results support that,” Lebwohl said. “Our findings suggest that pizza, pasta and foods served at dinner were more likely to have a problem.”
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The data was crowd-sourced, as users of the portable Nima Gluten Sensor uploaded the results from tested restaurant foods throughout the United States. The device’s manufacturer supplied for study 5,624 food tests taken by 804 users over 18 months.
“The crowd-sourced nature of these data provides an unprecedented view of restaurant testing of food throughout the United States,” the study’s authors wrote. “As such, this is the largest study to date on gluten contamination of restaurant foods. … It reveals that a significant percentage of GF labeled restaurant foods contain detectable levels of gluten.”
The research showed 32 percent of tests revealed detectable gluten in dishes that were supposed to be gluten-free. The results varied by the type of food tested:
- 53% of gluten-free pizza.
- 51% of gluten-free pasta samples.
- 34% of dinners (eaten between 3 p.m. and midnight).
- 30% of fish, burgers, french fries, salads and desserts.
- 29% of lunches (11 a.m. until 2:59 p.m.).
- 27% of breakfasts (5 a.m. until 10:59 a.m.).
However, Lebwohl noted the data has its limitations, including the sensitivity of the device. To be labeled gluten-free in the U.S., a product must contain less than 20 parts per million.
“The device can detect levels as low as 5 to 10 ppm, which most do not consider clinically significant, so a ‘gluten found’ result does not necessarily mean ‘unsafe for celiac disease.’ The device also does not detect certain forms of gluten, such as fermented gluten. So both false positives and false negatives will affect this estimate,” Lebwohl said in the statement.
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In addition, it’s possible the device users didn’t report all of their findings. “Users may have uploaded results that surprised them the most,” Lebwohl said.
Also, the study did not include systemic testing of gluten-free foods. Users of the testing device may have been more likely to test and report results of foods they suspected would include gluten; they also might have been more likely to share test results when gluten was found than when it wasn’t, the study pointed out.
Of the included tests, 59.2% were taken at dinner time; 26.6 percent during lunchtime; 11.3% at breakfast; and 3% between midnight and 4:59 a.m.
Researchers were surprised by the types of restaurants that were better at not contaminating their gluten-free foods. Quick-service restaurants’ gluten-free-labeled foods contained gluten 33% of the time; casual restaurants, 28.6 percent; and fast-casual restaurants, 22.3%. However, only one-fifth of the test results came from chain restaurants that researchers could categorize this way, the study noted.
“It is fair to conclude that less-expensive restaurants and chain restaurants do not [fare] worse than their more expensive and independent counterparts regarding gluten contamination,” the authors wrote. (The wrong fair was used in the published study.)
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The authors suggest that future studies look at the amount of gluten contamination in specific foods and how to reduce gluten contamination in restaurants, they wrote in the study.
The reported data allowed researchers to examine socio-economic statistics as well:
- Of the diners, 62.5% reside in zip codes with the highest 25% of median household incomes; 18.6% resided in the second-highest quartile; 11.3% in the third-highest; and 7.7% in the lowest.
- The lowest finding of unreported gluten, 27.2%, was in restaurants in the lowest-income zip codes. The rate of finding gluten in gluten-free foods were 31.2% in the second-lowest quartile; 32.5% in second-highest; and 32.7% in the highest.
A geographic analysis found that the gluten-free label seemingly was more accurate in the West, where 30.2% of gluten-free-labeled food contained gluten. In the South, 32.2% did; and in the Midwest and Northeast, 34.5% contained gluten. The authors speculated that because people in the West generally at more produce and live healthier lifestyles—and have the highest ration of non-celiac gluten sensitivity—diners and restaurant staff might be more aware of gluten issues and cross-contamination.
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Results were received from all 50 states. Of all the tests submitted, 45.8% came from western states, while 17.4% came from northeastern states.
The study was supported by the National Institutes of Health and National Institute on Aging.