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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/why-you-feel-full-after-eating" 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="2021-12-07T00:00:00-05:00" class="date-display-single">December 7, 2021</span></p><div class='syndicate'><h1>Why you feel full after eating</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Researchers identified brain cells that help suppress hunger and regulate food intake.</li>
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<li>The findings may help lead to better treatments for excessive eating and obesity.</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="Young girl licking her lips and eying a huge stack of pancakes">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2021/20211207-food.jpg?itok=DaDJJec6&timestamp=1638885228 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/2021/20211207-food.jpg?itok=moL-BD_9&timestamp=1638885228 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/2021/20211207-food.jpg?itok=rH7MM9qV&timestamp=1638885228 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/2021/20211207-food.jpg?itok=cK4fgltL&timestamp=1638885228 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/2021/20211207-food.jpg?itok=TBfJusAQ&timestamp=1638885228 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/2021/20211207-food.jpg?itok=moL-BD_9&timestamp=1638885228" alt="Young girl licking her lips and eying a huge stack of pancakes" title="Young girl licking her lips and eying a huge stack of pancakes" />
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</picture><span class="caption">Scientists are honing in on the brain circuits that help control hunger and regulate food intake.</span><span class="credit">Ahturner / Shutterstock</span></div>
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</div><p>The brain plays a critical role in controlling body weight. It signals when to eat and when to stop. Not feeling full, or satiated, can lead to overeating and obesity.</p>
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<p>Researchers have identified brain regions involved in how the brain regulates food intake. These include the hypothalamus and hindbrain. However, drugs targeting neurons in these regions have been largely unsuccessful for weight loss.</p>
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<p>A team led by Drs. J. Nicholas Betley of the University of Pennsylvania, Albert Chen of the Scintillon Institute, and Laura Holsen of Brigham and Women's Hospital set out to study the brain circuits that signal fullness after eating. They reasoned that people with Prader-Willi syndrome might offer clues: a main symptom of the disorder is extreme appetite and overeating. Prader-Willi syndrome is the leading genetic cause of life-threatening obesity. The team studied people with the disorder to better understand how the brain controls food intake.</p>
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<p>The study was funded by NIH’s National Institute of Neurological Disorders and Stroke (NINDS), National Institute of Mental Health (NIMH), and National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Results appeared in <em>Nature </em>on November 17, 2021.</p>
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||
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||
<p>The team analyzed brain scans from 12 women and 2 men with Prader-Willi syndrome as well as a control group. The participants underwent fMRI scans while being shown images of food after fasting or shortly after eating. fMRI scans measure brain activity based on changes in blood flow. The scans revealed significant differences in the cerebellum between the patients and the control group, suggesting that the region plays an important role in controlling hunger.</p>
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||
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||
<p>To further understand the underlying brain circuits, the scientists conducted studies in mice. They found that the activities of a subset of neurons in a structure deep in the cerebellum called the anterior deep cerebellar nuclei (aDCN) were associated with eating. Experiments showed that inhibiting aDCN neurons led to the mice eating larger meals. Activating these neurons reduced the animals’ food intake. The mice ate smaller meals and spent less time eating even though they ate just as often as control mice.</p>
|
||
|
||
<p>Further experiments found that these neurons seemed to be helping the mice track calories and adjust their intake. </p>
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||
<p>A final set of experiments focused on understanding how the cerebellum interacts with reward circuits in the brain that are known to influence eating. They found that aDCN activity stops food intake by increasing dopamine levels in the brain’s ventral striatum, which is involved in reward behavior. The scientists believe that long-lasting increases in baseline levels of dopamine may reduce meal size by blunting the rewarding effect of food.</p>
|
||
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||
<p>“There may be a Goldilocks principle, making sure you eat just enough,” Betley explains. “Too much dopamine blocks the subsequent spike to rewards, ultimately changing behavior.”</p>
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||
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||
<p>The findings point to new therapeutic targets for managing the excessive eating in Prader-Willi syndrome. These results may also hold promise for the development of more effective treatments for obesity.</p>
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<p>—by Erin Bryant</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/hormone-suppresses-hunger-primates-people" target="_top">Hormone Suppresses Hunger in Primates and People</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/repurposed-drug-combats-obesity-mice" target="_top">Repurposed Drug Combats Obesity in Mice</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/molecular-ties-between-lack-sleep-weight-gain" target="_top">Molecular Ties Between Lack of Sleep and Weight Gain</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/gut-communicates-directly-brain" target="_top">Gut Communicates Directly with Brain</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/benefits-moderate-weight-loss-people-obesity" target="_top">Benefits of Moderate Weight Loss in People with Obesity</a></li><li><a href="https://www.nhlbi.nih.gov/health-topics/overweight-and-obesity" target="_top">Overweight and Obesity</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/34789878/">Reverse-translational identification of a cerebellar satiation network.</a> Low AYT, Goldstein N, Gaunt JR, Huang KP, Zainolabidin N, Yip AKK, Carty JRE, Choi JY, Miller AM, Ho HST, Lenherr C, Baltar N, Azim E, Sessions OM, Ch'ng TH, Bruce AS, Martin LE, Halko MA, Brady RO Jr, Holsen LM, Alhadeff AL, Chen AI, Betley JN. <em>Nature.</em> 2021 Nov 17. doi: 10.1038/s41586-021-04143-5. Online ahead of print. PMID: 34789878.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Neurological Disorders and Stroke (NINDS), National Institute of Mental Health (NIMH), National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), and NIH BRAIN Initiative; Searle Scholars Program; The Pew Charitable Trusts; McKnight Foundation; National University of Singapore; Monell Chemical Senses Center; Klingenstein-Simons Fellowship Award; American Heart Association; Penn Institute for Diabetes, Obesity, and Metabolism; University of Pennsylvania; American Diabetes Association; Whitehall Foundation; Warwick-NTU Neuroscience Programme; Singapore Ministry of Education.</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/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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<p><strong>Editor:</strong> Harrison Wein, 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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