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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<div about="/news-events/nih-research-matters/how-diet-may-disrupt-gut-microbes-promote-weight-gain" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2022-10-04T00:00:00-04:00" class="date-display-single">October 4, 2022</span></p><div class='syndicate'><h1> How diet may disrupt gut microbes to promote weight gain</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Mice fed a high-sugar diet lost immune cells in their guts that normally help regulate the absorption of dietary fat.</li>
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<li>Loss of these immune cells, which led to weight gain and early signs of diabetes, was driven by changes in gut microbes caused by high sugar intake.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="3D illustration of human intestine with bacteria">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2022/20220930-gut.jpg?itok=NHQnOFQk&timestamp=1664893024 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2022/20220930-gut.jpg?itok=vGCMyOfk&timestamp=1664893024 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2022/20220930-gut.jpg?itok=vgP13mOj&timestamp=1664893024 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2022/20220930-gut.jpg?itok=DbhTd2FZ&timestamp=1664893024 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2022/20220930-gut.jpg?itok=tEcU_AnP&timestamp=1664893024 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2022/20220930-gut.jpg?itok=vGCMyOfk&timestamp=1664893024" alt="3D illustration of human intestine with bacteria" title="3D illustration of human intestine with bacteria" />
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</picture><span class="caption">Emerging evidence shows how the food we eat can alter the bacteria in our guts to affect weight and metabolism. </span><span class="credit">Rost9 / Shutterstock</span></div>
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</div><p>Western-style diets, which are high in fat and sugar, are linked to weight gain. In turn, excess weight and obesity can lead to metabolic diseases such as type 2 diabetes. The mechanisms in the body that underlie these relationships aren’t fully understood. They’re thought to involve the immune system and the microbes that live in the gut.</p>
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||
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||
<p>NIH-funded researchers led by Dr. Ivaylo Ivanov from Columbia University have been using mice to look at these complex relationships. In their new study, they carefully compared mice fed a diet high in fat and sugar with mice fed a low-sugar diet. Results were published on September 15, 2022, in <em>Cell</em>.</p>
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||
|
||
<p>Mice fed a chow high in fat and sugar gained weight compared with mice fed a normal grain-based chow. They also developed early signs of diabetes. After only a week on the high-fat, high-sugar diet, the mice had changes in the immune cells in their guts. Notably, they had fewer Th17 immune cells, which are thought to help protect against weight gain and metabolic problems.</p>
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||
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||
<p>Previous studies have shown that a specific type of bacteria in the gut called segmented filamentous bacteria promotes the production of Th17 cells in mice. The team found that, in mice fed the high-fat, high-sugar diet, levels of these bacteria decreased sharply, followed by a drop in production of Th17 cells.</p>
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||
<p>When the researchers engineered mice unable to produce Th17 cells, the presence of the helpful bacteria didn’t protect the animals from weight gain and signs of metabolic disease. Conversely, when the researchers restored Th17 cells into the mice, the mice maintained a healthy weight and didn’t develop early signs of diabetes. Transplanting the helpful bacteria into normal mice on the high-fat, high-sugar diet had a similar protective effect.</p>
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||
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||
<p>Further work implicated sugar—specifically sucrose, a major component of table sugar—as driving these effects. When mice with the helpful bacteria were fed a high-fat diet where all of the sugar was replaced with starch, they remained at a healthy weight and didn’t develop early signs of diabetes. When mice on this sugar-free diet received sucrose in their drinking water, their Th17 cells dropped, and they gained weight.</p>
|
||
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||
<p>The researchers next looked at changes in the gut microbes of mice on the high-sugar diet. They found that dietary sucrose greatly increased the amount of bacteria from a family called <em>Erysipelotrichaceae</em> in the gut. These bacteria, in turn, appeared to push out the helpful bacteria that trigger Th17 cell production.</p>
|
||
|
||
<p>Finally, the researchers looked at how Th17 cells might help prevent weight gain and metabolic disease. They found that, normally, Th17 cells help slow the uptake of certain dietary fats into intestinal cells and decrease inflammation in the gut. Without the Th17 cells, fat absorption and gut inflammation increased.</p>
|
||
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||
<p>“Our study emphasizes that a complex interaction between diet, microbiota, and the immune system plays a key role in the development of obesity, metabolic syndrome, type 2 diabetes, and other conditions,” Ivanov says.</p>
|
||
|
||
<p>Gut microbes differ between people and mice. However, an analysis of past studies found that adults with metabolic syndrome had fewer gut microbes known to induce the production of Th17 cells. More work is needed to understand the effects of dietary sugar on gut microbes in humans.</p>
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<p>—by Sharon Reynolds</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/gut-cells-distinguish-between-sugar-artificial-sweeteners" target="_top">Gut Cells Distinguish Between Sugar and Artificial Sweeteners</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/how-fructose-may-contribute-obesity-cancer" target="_top">How Fructose May Contribute to Obesity and Cancer</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/low-fat-diet-compared-low-carb-diet" target="_top">Low-Fat Diet Compared to Low-Carb Diet</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/how-high-fructose-intake-may-trigger-fatty-liver-disease" target="_top">How High Fructose Intake May Trigger Fatty Liver Disease</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/high-blood-sugar-may-blunt-benefits-aerobic-exercise" target="_top">High Blood Sugar May Blunt Benefits of Aerobic Exercise</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/high-sugar-intake-worsens-autoimmune-disease-mice" target="_top">High Sugar Intake Worsens Autoimmune Disease in Mice</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/immune-cells-gut-slow-metabolism" target="_top">Immune Cells in the Gut Slow Metabolism</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/how-dietary-factors-influence-disease-risk" target="_top">How Dietary Factors Influence Disease Risk</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/gut-bacteria-may-influence-metabolic-syndrome" target="_top">Gut Bacteria May Influence Metabolic Syndrome</a></li><li><a href="https://www.nhlbi.nih.gov/health/overweight-and-obesity" target="_top">Overweight and Obesity</a></li><li><a href="https://www.niddk.nih.gov/health-information/diet-nutrition" target="_top">Diet & Nutrition</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/36041436/">Microbiota imbalance induced by dietary sugar disrupts immune-mediated protection from metabolic syndrome.</a> Kawano Y, Edwards M, Huang Y, Bilate AM, Araujo LP, Tanoue T, Atarashi K, Ladinsky MS, Reiner SL, Wang HH, Mucida D, Honda K, Ivanov II. <em>Cell</em>. 2022 Sep 15;185(19):3501-3519.e20. doi: 10.1016/j.cell.2022.08.005. Epub 2022 Aug 29. PMID: 36041436.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institute of Allergy and Infectious Diseases (NIAID), and National Institute of Biomedical Imaging and Bioengineering (NIBIB); Burroughs Wellcome Fund; MSD Life Science Foundation; Russell Berrie Foundation; Naomi Berrie Diabetes Center; Japan Society for the Promotion of Science; National Science Foundation; Irma T. Hirschl Trust.</p>
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