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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2013-04-22T00:00:00-04:00" class="date-display-single">April 22, 2013</span></p><div class='syndicate'><h1>Red Meat-Heart Disease Link Involves Gut Microbes</h1><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2013/20130422-meat.jpg?itok=q6jibc0z&timestamp=1431632349 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/2013/20130422-meat.jpg?itok=sYv_8fBA&timestamp=1431632349 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/2013/20130422-meat.jpg?itok=BTiqYQ2i&timestamp=1431632349 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/2013/20130422-meat.jpg?itok=5MV1tvCQ&timestamp=1431632349 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/2013/20130422-meat.jpg?itok=bENSopcl&timestamp=1431632349 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2013/20130422-meat.jpg?itok=sYv_8fBA&timestamp=1431632349" alt="Medium rare steak." title="Medium rare steak" />
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</div><p>The link between red meat consumption and heart disease, a study suggests, may stem from gut microbes breaking down carnitine, a compound found in red meat.</p>
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<p>People who eat a lot of red meat have an increased risk for cardiovascular disease. The saturated fats and cholesterol in meat are thought to be culprits. But they can’t fully account for the association, suggesting that other factors may be involved.</p>
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<p>The digestive system is home to trillions of microbes. These microbes, collectively known as the microbiota, help break down our food, forming a variety of small compounds in the process. One of these compounds is trimethylamine, which can be metabolized to form trimethylamine-<em>N</em>-oxide (TMAO). TMAO has been associated with atherosclerosis, a disease in which plaque builds up inside the arteries.</p>
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<p>A team led by Dr. Stanley L. Hazen and Robert A. Koeth of the Cleveland Clinic thought there might be a link between heart disease and the compound carnitine, which is abundant in red meat and contains a trimethylamine structure. Their research was funded in part by NIH’s National Heart, Lung and Blood Institute (NHLBI) and Office of Dietary Supplements (ODS). The findings appeared online on April 7, 2013, in <em>Nature Medicine.</em></p>
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<p>When the scientists asked people to consume a beef steak and a carnitine supplement, regular meat eaters produced more TMAO than vegans or vegetarians. When participants took antibiotics to suppress gut microbes, they produced less TMAO after eating carnitine. This suggests that gut microbes are involved in the production of TMAO from carnitine.</p>
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<p>The team assessed the types of microbes in the participants’ digestive systems and discovered differences between the meat eaters and non-meat eaters. They also found links between carnitine consumption and plasma TMAO levels, suggesting that eating habits may influence gut microbiota and thus the ability to form TMAO from carnitine.</p>
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<p>The team next examined about 2,600 patients undergoing cardiac evaluations. They found that plasma carnitine levels were associated with the risk for heart disease and cardiac events such as heart attack, stroke and death. These relationships only held in people with high TMAO levels, suggesting that TMAO is a key link between carnitine and cardiovascular risk.</p>
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<p>To investigate further, the researchers studied germ-free mice with no pre-existing gut microbiota. They found that these mice didn’t make TMAO when first fed carnitine. However, when the mice were allowed to acquire conventional microbiota, carnitine feeding then led to TMAO formation.</p>
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<p>Mice fed a diet supplemented with carnitine for several months showed evidence of altered intestinal microbes, a greater ability to produce TMAO from carnitine, and increased atherosclerosis. Parallel mice fed the same diet but given an antibiotic to suppress gut microbiota had lower plasma TMAO and no increase in atherosclerosis. In further experiments, the researchers found that TMAO affects a major pathway for clearing cholesterol from the body, providing a potential mechanism for how TMAO might promote atherosclerosis.</p>
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<p>These findings could help explain the elevated health risks associated with red meats. “The composition of bacteria living in our digestive tracts is dictated by our long-term dietary patterns,” says Hazen. “A diet high in carnitine actually shifts our gut microbe composition to those that like carnitine, making meat eaters even more susceptible to forming TMAO, which helps promote atherosclerosis.”</p>
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<p>— by Carol Torgan, Ph.D.</p>
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</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/risk-red-meat" target="_top">Risk in Red Meat?</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/gut-microbes-affect-weight-after-gastric-bypass" target="_top">Gut Microbes Affect Weight After Gastric Bypass</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/healthy-human-microbiome" target="_top">The Healthy Human Microbiome</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/early-antibiotic-use-may-affect-weight" target="_top">Early Antibiotic Use May Affect Weight</a></li><li><a href="https://newsinhealth.nih.gov/issue/nov2012/feature1" target="_top">Your Microbes and You: The Good, Bad and Ugly</a></li><li><a href="http://www.nhlbi.nih.gov/health/health-topics/topics/atherosclerosis/" target="_top">Atherosclerosis</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/23563705">Nat Med.</a> 2013 Apr 7. doi: 10.1038/nm.3145. [Epub ahead of print]. PMID: 23563705.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Heart, Lung and Blood Institute (NHLBI), Office of Dietary Supplements, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and National Institute of General Medical Sciences (NIGMS), with additional funding from the Leducq Foundation, the Leonard Krieger Fund, and the American Heart Association.</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-can-we-slow-aging">Research in Context: Can we slow aging?</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/brain-changes-observed-during-pregnancy">Brain changes observed during pregnancy</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-detecting-cancer">Research in Context: Detecting cancer</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/risk-future-burden-dementia-united-states">Risk and future burden of dementia in the United States </a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<div id="block-bean-research-matters-about" class="block block--bean box block--bean-research-matters-about" id="block-bean-research-matters-about" class="block block--bean box block--bean-research-matters-about">
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<h3 class="block__title">About NIH Research Matters</h3>
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<div class="content" class="block__content">
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<div about="/block/research-matters---about" class="ds-1col entity entity-bean bean-research-matters-block view-mode-default clearfix">
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<p><strong>Editor:</strong> Harrison Wein, Ph.D.</p>
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<p><strong>Assistant Editors:</strong> Vicki Contie and Brian Doctrow, Ph.D.</p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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<p>ISSN 2375-9593</p>
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