{"id":19757,"date":"2026-11-11T10:30:00","date_gmt":"2026-11-11T08:30:00","guid":{"rendered":"https:\/\/glutendtrotters.com\/?p=19757"},"modified":"2026-11-03T15:51:27","modified_gmt":"2026-11-03T13:51:27","slug":"shared-fryers-celiac-disease-study","status":"publish","type":"post","link":"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/","title":{"rendered":"Shared Fryers and Celiac Disease: What a New Study Really Shows About the Risk"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Anyone with celiac disease who has ever eaten out has asked some version of this question: <strong>were these fries cooked in the same fryer as the breaded onion rings or the chicken tenders?<\/strong> For years, the standard advice has been unambiguous \u2014 avoid anything cooked in a fryer shared with gluten-containing foods, full stop, no exceptions. A study published this month in the journal <em>Nutrients<\/em> is the first to put real numbers behind that risk at this scale, and the answer turns out to be more nuanced than the blanket rule suggests: not a flat yes or no, but a &#8220;it depends \u2014 and here&#8217;s what it depends on.&#8221;<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #000000;color:#000000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #000000;color:#000000\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#What_the_study_actually_tested\" >What the study actually tested<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#The_numbers_that_matter\" >The numbers that matter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#The_pushback_what_Gluten_Free_Watchdog_has_to_say\" >The pushback: what Gluten Free Watchdog has to say<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#Where_the_study_falls_short\" >Where the study falls short<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#What_this_means_for_your_next_trip\" >What this means for your next trip<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#Is_it_safe_for_someone_with_celiac_disease_to_eat_fries_cooked_in_a_shared_fryer\" >Is it safe for someone with celiac disease to eat fries cooked in a shared fryer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#Whats_the_difference_between_fries_and_tortilla_chips_in_this_study\" >What&#8217;s the difference between fries and tortilla chips in this study?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#Does_changing_the_fryer_oil_daily_eliminate_cross-contact_risk\" >Does changing the fryer oil daily eliminate cross-contact risk?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#Why_doesnt_Gluten_Free_Watchdog_fully_agree_with_the_studys_conclusions\" >Why doesn&#8217;t Gluten Free Watchdog fully agree with the study&#8217;s conclusions?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/glutendtrotters.com\/en\/shared-fryers-celiac-disease-study\/#What_should_I_do_if_I_want_to_order_fries_at_a_restaurant_while_traveling\" >What should I do if I want to order fries at a restaurant while traveling?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_the_study_actually_tested\"><\/span>What the study actually tested<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The paper, titled <em>&#8220;Shared Fryers May Not Always Be as Risky for Gluten Cross-Contact in Celiac Disease as Dietary Guidance Suggests,&#8221;<\/em> went online on <strong>October 20, 2026<\/strong>, in <em>Nutrients<\/em> (vol. 18, issue 20, article 3433). The author list includes researchers from some of the biggest names in US celiac care: Vanessa Maltin Weisbrod and Meghan Donnelly McKeon from the Celiac Disease Foundation, Marisa Gallant Stahl and Edwin Liu from Children&#8217;s Hospital Colorado and the University of Colorado, Jessica Lebovits and Jackie Jossen from Columbia University&#8217;s Celiac Disease Center, and Maureen M. Leonard from Mass General Brigham for Children.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large gt-horizontal\"><a href=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora.jpeg\"><picture class=\"gt-avif-picture\"><source type=\"image\/avif\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-1024x559.avif 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-300x164.avif 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-768x419.avif 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora.avif 1408w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><source type=\"image\/webp\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-1024x559.webp 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-300x164.webp 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-768x419.webp 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora.webp 1408w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><img data-no-lazy=\"1\" loading=\"lazy\" data-gt-avif=\"1\" decoding=\"async\" width=\"1024\" height=\"559\" src=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-1024x559.jpeg\" alt=\"Tortilla chips in a fryer\" class=\"wp-image-19965\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-1024x559.jpeg 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-300x164.jpeg 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-768x419.jpeg 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora.jpeg 1408w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/picture><\/a><figcaption class=\"wp-element-caption\">None of the 43 tortilla chip samples cooked in shared fryers exceeded 5 ppm of gluten. Illustrative image.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The team collected <strong>98 samples of naturally gluten-free food<\/strong> \u2014 55 orders of French fries and 43 of tortilla chips \u2014 cooked in fryers shared with gluten-containing items, from restaurants and food-service venues across <strong>14 US states<\/strong>, between September 2025 and January 2026. Every sample was tested with an ELISA assay, using a 5 ppm limit of quantification and the 20 ppm threshold that both US and EU regulations use to define &#8220;gluten-free&#8221; labeling.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_numbers_that_matter\"><\/span>The numbers that matter<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>84 of the 98 samples (85.7%)<\/strong> came back under 5 ppm.<\/li>\n\n\n\n<li><strong>8 samples (8.2%)<\/strong> fell between 5 and 20 ppm.<\/li>\n\n\n\n<li><strong>6 samples (6.1%)<\/strong> came in above 20 ppm, with readings as high as over 80 ppm.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The clearest pattern in the data was about the <strong>food itself<\/strong>: all six samples above 20 ppm were French fries (6 of 55, or 10.9%). Not a single one of the 43 tortilla chip samples went above even the 5 ppm floor. That gap was statistically significant, though the authors admit they can&#8217;t tell whether it comes down to the food, or to how it&#8217;s prepared \u2014 for instance, whatever else was fried in that same oil beforehand.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How often a restaurant changed its fryer oil mattered too: among the <strong>39 locations that changed oil daily, zero samples exceeded 20 ppm<\/strong>; among the <strong>35 that changed it weekly, 4 samples did (11.4%)<\/strong>; and among the 24 that couldn&#8217;t say how often, 2 samples (8.3%) crossed the line. The daily-versus-weekly difference reached statistical significance, but the authors are careful to call it an association, not proof of cause and effect \u2014 and with only six exceedances in total, that particular conclusion is riding on very small numbers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Based on all this, the authors argue that shared fryers <strong>&#8220;are not inherently high-risk sources of gluten cross-contact&#8221;<\/strong> across the board, and make the case that dietitians and physicians should help patients stratify risk rather than enforce a one-size-fits-all ban \u2014 the goal being to cut down on the food anxiety and quality-of-life hit that comes from reflexively avoiding every shared fryer when eating out.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large gt-horizontal\"><a href=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia.jpeg\"><picture class=\"gt-avif-picture\"><source type=\"image\/avif\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-1024x559.avif 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-300x164.avif 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-768x419.avif 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia.avif 1408w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><source type=\"image\/webp\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-1024x559.webp 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-300x164.webp 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-768x419.webp 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia.webp 1408w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><img data-no-lazy=\"1\" loading=\"lazy\" data-gt-avif=\"1\" decoding=\"async\" width=\"1024\" height=\"559\" src=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-1024x559.jpeg\" alt=\"Heavily contaminated, dirty fryer\" class=\"wp-image-19963\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-1024x559.jpeg 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-300x164.jpeg 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia-768x419.jpeg 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/Freidora-sucia.jpeg 1408w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/picture><\/a><figcaption class=\"wp-element-caption\">The longer the oil is in use, the higher the risk: at restaurants that changed it daily, no sample exceeded 20 ppm. Illustrative image.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_pushback_what_Gluten_Free_Watchdog_has_to_say\"><\/span>The pushback: what Gluten Free Watchdog has to say<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Gluten Free Watchdog<\/strong>, which has spent more than 15 years testing gluten-free-labeled products, published its own response that complicates the picture a bit. The group calls the study &#8220;a thoughtful reframing&#8221; with real merit, but flags one issue it considers significant: the paper doesn&#8217;t cite two 2025 FDA-led studies that point to a methodological problem underneath all of this.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Those FDA studies (led by Jiang and colleagues) found that <strong>gluten becomes progressively harder to detect by ELISA the longer it sits in hot oil<\/strong> \u2014 after ten minutes of frying, only about 44% of the gluten actually present could still be detected. In other words, normal frying temperatures may well interfere with detection, the opposite of what the Weisbrod study assumes, which would mean the measured values here \u2014 and in Gluten Free Watchdog&#8217;s own 2021 study \u2014 could be <strong>underestimating how much gluten is really there<\/strong>. The same FDA research also showed that oil reused for ten batches of breaded shrimp climbed from roughly 51 ppm to roughly 260 ppm of gluten, and that proper oil filtration meaningfully cuts residual gluten.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gluten Free Watchdog&#8217;s bottom-line advice, despite appreciating the effort to stratify risk, stays conservative: <strong>avoid naturally gluten-free foods cooked in fryers shared with gluten-containing items whenever possible<\/strong>, and favor restaurants that keep a dedicated gluten-free fryer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Where_the_study_falls_short\"><\/span>Where the study falls short<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Restaurants weren&#8217;t randomly selected<\/strong>, which limits how far the findings generalize.<\/li>\n\n\n\n<li><strong>Oil-change frequency was self-reported by staff<\/strong>, with no independent verification.<\/li>\n\n\n\n<li><strong>Only one sample per restaurant, on a single occasion<\/strong> \u2014 there&#8217;s no data on how much a given fryer&#8217;s gluten level swings over the course of a day or week.<\/li>\n\n\n\n<li>Filtration type, oil temperature, and cleaning practices weren&#8217;t recorded, even though Gluten Free Watchdog argues all three matter.<\/li>\n\n\n\n<li>The study measured gluten in the food, not any clinical outcome \u2014 no symptoms, no intestinal damage, nothing about what these exposure levels actually do to someone with celiac disease.<\/li>\n\n\n\n<li>It was conducted entirely in the US; there&#8217;s no equivalent data yet for restaurants in Spain or elsewhere in Europe, where kitchen practices can differ.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_this_means_for_your_next_trip\"><\/span>What this means for your next trip<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This study is not a green light to order anything that comes out of a shared fryer. What it does offer is a useful nuance: <strong>the risk isn&#8217;t evenly spread, and it seems to cluster at restaurants that change their oil less often<\/strong>. Asking whether the fryer is shared, and if so, how frequently the oil gets changed, is a reasonable question with some science behind it now \u2014 though as Gluten Free Watchdog points out, even daily changes don&#8217;t guarantee zero risk, and a single question can&#8217;t capture everything else that matters, like how many batches have already gone through that fryer that day or what else is being cooked in it.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full gt-horizontal\"><picture class=\"gt-avif-picture\"><source type=\"image\/avif\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina.avif 1600w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-300x225.avif 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-1024x768.avif 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-768x576.avif 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-1536x1152.avif 1536w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-500x375.avif 500w\" sizes=\"(max-width: 1600px) 100vw, 1600px\"><source type=\"image\/webp\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina.webp 1600w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-300x225.webp 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-1024x768.webp 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-768x576.webp 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-1536x1152.webp 1536w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-500x375.webp 500w\" sizes=\"(max-width: 1600px) 100vw, 1600px\"><img data-no-lazy=\"1\" loading=\"lazy\" data-gt-avif=\"1\" decoding=\"async\" width=\"1600\" height=\"1200\" src=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina.jpg\" alt=\"Metal basket of a commercial fryer in a restaurant kitchen\" class=\"wp-image-19969\" srcset=\"https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina.jpg 1600w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-300x225.jpg 300w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-1024x768.jpg 1024w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-768x576.jpg 768w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-1536x1152.jpg 1536w, https:\/\/glutendtrotters.com\/wp-content\/uploads\/2026\/11\/freidora-cesta-cocina-500x375.jpg 500w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/><\/picture><figcaption class=\"wp-element-caption\">Asking whether the fryer is shared and how often the oil is changed is reasonable, but it is not a guarantee. Photo: engin akyurt \/ Unsplash.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">When you&#8217;re traveling \u2014 where you have far less control over how your food is actually prepared \u2014 caution still tends to be the safer bet: <strong>look for restaurants with a fryer dedicated solely to gluten-free items<\/strong> whenever that&#8217;s an option, especially in places where you can&#8217;t easily verify kitchen practices for yourself. As always, this is just one more piece of the broader <a href=\"https:\/\/glutendtrotters.com\/en\/celiac-cross-contamination\/\" target=\"_blank\" rel=\"noreferrer noopener\">cross-contamination<\/a> puzzle: read the menu carefully, don&#8217;t be shy about asking questions, and when in doubt, pick something else.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Source: Weisbrod VM, McKeon MD, Stahl MG, Germone M, Nagle S, Jossen J, Lebovits J, Leonard MM, Perl J, Liu E, et al. &#8220;Shared Fryers May Not Always Be as Risky for Gluten Cross-Contact in Celiac Disease as Dietary Guidance Suggests&#8221;. <\/em>Nutrients<em>, 2026; 18(20): 3433. DOI: <a href=\"https:\/\/doi.org\/10.3390\/nu18203433\" target=\"_blank\" rel=\"noopener\">10.3390\/nu18203433<\/a>. Cross-checked against coverage from the <\/em><a href=\"http:\/\/celiac.org\/2026\/10\/20\/new-shared-fryer-study-offers-real-world-data-for-people-with-celiac-disease\/\" target=\"_blank\" rel=\"noopener\">Celiac Disease Foundation<\/a><em> (10\/20\/2026) and the analysis from <\/em><a href=\"https:\/\/www.glutenfreewatchdog.org\/news\/gluten-cross-contact-in-shared-fryers-what-four-studies-two-fda-led-tell-us\/\" target=\"_blank\" rel=\"noopener\">Gluten Free Watchdog<\/a><em> (10\/20\/2026). This article is for information purposes only and doesn&#8217;t replace advice from your doctor or dietitian.<\/em><\/p>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-fryers-1\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"Is_it_safe_for_someone_with_celiac_disease_to_eat_fries_cooked_in_a_shared_fryer\"><\/span>Is it safe for someone with celiac disease to eat fries cooked in a shared fryer?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>According to this study, it&#8217;s not uniformly unsafe, but it&#8217;s not risk-free either: 6% of the samples tested (all of them fries) came in above the 20 ppm threshold, with readings as high as over 80 ppm. The risk is real, just not evenly distributed.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-fryers-2\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"Whats_the_difference_between_fries_and_tortilla_chips_in_this_study\"><\/span>What&#8217;s the difference between fries and tortilla chips in this study?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>None of the 43 tortilla chip samples went above the 5 ppm limit of quantification, while 6 of the 55 fries samples (nearly 11%) came in above 20 ppm. That difference was statistically significant.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-fryers-3\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"Does_changing_the_fryer_oil_daily_eliminate_cross-contact_risk\"><\/span>Does changing the fryer oil daily eliminate cross-contact risk?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>It cuts it substantially: none of the samples from restaurants that changed oil daily exceeded 20 ppm, versus 11.4% at restaurants that changed it weekly. But Gluten Free Watchdog warns this isn&#8217;t a guarantee of zero risk, since gluten can build up between changes and may be harder to detect once the oil is hot.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-fryers-4\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"Why_doesnt_Gluten_Free_Watchdog_fully_agree_with_the_studys_conclusions\"><\/span>Why doesn&#8217;t Gluten Free Watchdog fully agree with the study&#8217;s conclusions?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Because two 2025 FDA-led studies found that typical frying temperatures make gluten harder to detect by ELISA \u2014 after 10 minutes of frying, only about 44% of the gluten actually present was still detectable. That suggests the measured values in this and similar studies could be underestimating the real gluten levels.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-fryers-5\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><span class=\"ez-toc-section\" id=\"What_should_I_do_if_I_want_to_order_fries_at_a_restaurant_while_traveling\"><\/span>What should I do if I want to order fries at a restaurant while traveling?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Asking whether the fryer is shared and how often the oil is changed is a reasonable question, but it&#8217;s not a guarantee. Whenever possible, it&#8217;s safer to choose restaurants with a fryer dedicated exclusively to gluten-free items.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is it safe for someone with celiac disease to eat fries cooked in a shared fryer?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"According to this study, it's not uniformly unsafe, but it's not risk-free either: 6% of the samples tested (all of them fries) came in above the 20 ppm threshold, with readings as high as over 80 ppm. The risk is real, just not evenly distributed.\"}},{\"@type\":\"Question\",\"name\":\"What's the difference between fries and tortilla chips in this study?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"None of the 43 tortilla chip samples went above the 5 ppm limit of quantification, while 6 of the 55 fries samples (nearly 11%) came in above 20 ppm. That difference was statistically significant.\"}},{\"@type\":\"Question\",\"name\":\"Does changing the fryer oil daily eliminate cross-contact risk?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It cuts it substantially: none of the samples from restaurants that changed oil daily exceeded 20 ppm, versus 11.4% at restaurants that changed it weekly. But Gluten Free Watchdog warns this isn't a guarantee of zero risk, since gluten can build up between changes and may be harder to detect once the oil is hot.\"}},{\"@type\":\"Question\",\"name\":\"Why doesn't Gluten Free Watchdog fully agree with the study's conclusions?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Because two 2025 FDA-led studies found that typical frying temperatures make gluten harder to detect by ELISA \u2014 after 10 minutes of frying, only about 44% of the gluten actually present was still detectable. That suggests the measured values in this and similar studies could be underestimating the real gluten levels.\"}},{\"@type\":\"Question\",\"name\":\"What should I do if I want to order fries at a restaurant while traveling?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Asking whether the fryer is shared and how often the oil is changed is a reasonable question, but it's not a guarantee. Whenever possible, it's safer to choose restaurants with a fryer dedicated exclusively to gluten-free items.\"}}]}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>A new study in Nutrients tested 98 samples of fries and tortilla chips cooked in shared fryers at US restaurants. Here&#8217;s what it found, how Gluten Free Watchdog pushes back on part of it, and what it means for eating out with celiac disease.<\/p>\n","protected":false},"author":2,"featured_media":19965,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"wprm-recipe-roundup-name":"","wprm-recipe-roundup-description":"","_gt_pin_image_url":"","footnotes":"","rank_math_description":"A Nutrients study tests 98 fryer samples: 6% exceed the 20 ppm gluten threshold. What it means for eating out with celiac disease.","rank_math_focus_keyword":"shared fryers celiac disease"},"categories":[515],"tags":[550],"wf_post_folders":[516],"class_list":["post-19757","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-gluten-free-science"],"_links":{"self":[{"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/posts\/19757","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/comments?post=19757"}],"version-history":[{"count":3,"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/posts\/19757\/revisions"}],"predecessor-version":[{"id":19971,"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/posts\/19757\/revisions\/19971"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/media\/19965"}],"wp:attachment":[{"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/media?parent=19757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/categories?post=19757"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/tags?post=19757"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/glutendtrotters.com\/en\/wp-json\/wp\/v2\/wf_post_folders?post=19757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}