Lentils and Gluten Cross Contact

Lentils and Gluten Cross Contact

The article Lentils and Gluten Cross Contact by Tricia Thompson, Trisha Lyons, and Amy Keller was published on April 29, 2022 in Frontiers in Nutrition. There is some good news in this brief research report.

If you are interested in watching a brief overview of our findings, please see our short powerpoint video with audio.

If you would prefer to read a summary of the findings, the abstract is pasted below.


Lentils are naturally gluten-free and are recommended for people with celiac disease and other gluten-related disorders. However, like oats, they appear to be at a heightened risk of cross contact with gluten-containing grains. The purpose of this study was to spot check for the presence of errant gluten-containing grains in a variety of brands of lentils purchased in 2021. Twenty-five bags of different dry lentil products representing 24 brands were purchased online and at various grocery stores. Each bag of lentils was individually hand sorted. Two of the 25 packages of lentils contained errant gluten-containing grains. One 16-ounce (454 g) bag contained a grain of wheat. Another 16-ounce (454 g) bag contained a grain of wheat and a grain of barley. For a product to be considered gluten-free in the United States, it must contain <20 mg of gluten per kilogram (or 20 parts per million of gluten). A product at the 20-ppm level of gluten should contain no more than 2 intact gluten-containing grains per kilogram or 35.27 ounces (1,000 g) of food (or 1 intact gluten-containing grain in 17.64 ounces [500 g] of food). Based on these calculations, a 16-ounce (454 g) bag of lentils containing 1 intact gluten-containing grain would not be considered gluten-free. Lentils are at risk of cross contact with gluten-containing grain. Consumers should continue to sort through lentils removing foreign grain, and rinse sorted lentils under running water to remove grain dust before cooking.

If you are interested in all the details, the article is available in full for free.

Full text available at: https://www.frontiersin.org/articles/10.3389/fnut.2022.867954/full

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