[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/share-dev.upmc.com\/2015\/09\/what-do-intestines-do-for-the-body\/#Article","mainEntityOfPage":"https:\/\/share-dev.upmc.com\/2015\/09\/what-do-intestines-do-for-the-body\/","headline":"What Are the Intestines?","name":"What Are the Intestines?","description":"Ever wonder how all that food you eat gets turned into the energy you use every day? Learn about how your large and small intestines absorb nutrients.","datePublished":"2015-09-06","dateModified":"2023-06-14","author":{"@type":"Organization","@id":"https:\/\/www.upmc.com\/services\/digestive-disorders-regions","name":"Digestive Disorders","url":"https:\/\/www.upmc.com\/services\/digestive-disorders-regions","sameAs":"https:\/\/share-dev.upmc.com\/digestive-disorders\/","parentOrganization":"UPMC"},"publisher":{"@type":"Organization","name":"UPMC HealthBeat","logo":{"@type":"ImageObject","@id":"https:\/\/share-dev.upmc.com\/wp-content\/uploads\/2019\/04\/UPMC-HealthBeat-Logo.png","url":"https:\/\/share-dev.upmc.com\/wp-content\/uploads\/2019\/04\/UPMC-HealthBeat-Logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/share-dev.upmc.com\/wp-content\/uploads\/2015\/09\/intestines.jpg","url":"https:\/\/share-dev.upmc.com\/wp-content\/uploads\/2015\/09\/intestines.jpg","height":527,"width":791},"url":"https:\/\/share-dev.upmc.com\/2015\/09\/what-do-intestines-do-for-the-body\/","about":["Family Health","Living and Wellness","Nutrition"],"wordCount":680,"keywords":["abdominal pain","Common intestinal diseases","Crohn's disease","diarrhea","energy","fatigue","fever","food","IBD","IBS","Intestinal Diseases","intestines","large intestines","small intestines"],"articleBody":"Ever wonder how all that food you eat turns into the energy you use every day? You might not think about your intestines very often, but they\u2019re probably at work right now, helping your body absorb needed nutrients.\u00a0Your intestines are a long continuous tube starting at the end of the stomach and running all the way to the anus. Intestines are the main organs that absorb essential nutrients from the foods you eat. They form the lower opening of the digestive tract, collecting nutrients not absorbed by the liver, gallbladder, pancreas, or stomach. Broken up into the small intestine and the large intestine, both have very important roles in how your body works. Below, you\u2019ll find information about these organs that will help you understand their important roles.\u00a0What Is the Small Intestine?\u00a0The longer of your two intestines, your small intestine is between 20 and 30 feet long and absorbs most of your food. There are three major sections of your small intestine which include:\u00a0Duodenum: Mixes semi-digested food with bile from your gallbladder, liver, and\u202fpancreas\u202fto break down food further.Jejunum: Absorbs fatty acids, sugars, and amino acids.Ileum: Absorbs most of the nutrients before passing food along to the large intestine.\u00a0\u00a0The walls of the small intestine are responsible for water absorption and puts nutrients into the bloodstream. The muscles around the small intestine push digested food along the intestines, through a process called peristalsis.\u00a0What Is the Large Intestine?\u00a0After passing through your small intestine, food then moves to the large intestine. The large intestine actually surrounds much of the gastrointestinal tract and covers the outer perimeter of your abdomen. Around five feet long, the large intestine absorbs salts and liquid left over from the digestive process.\u00a0Most nutrients are already absorbed by the time food enters your large intestine. Some substances are left over, including:\u00a0Fiber.\u00a0Plant material (which is hard to digest).\u00a0Dead cells.\u00a0Water.\u00a0Bile pigments.\u00a0After passing through the colon for reabsorption, these substances exit your body in the form of waste through your anus.\u00a0Common intestinal diseases and conditions\u00a0Your intestines have the largest surface area in your body, around 250 square meters, which allows your body to achieve maximum food absorption. Many diseases can affect your intestines, causing painful symptoms, like\u202fdiarrhea, fever and fatigue, abdominal pain, cramping, weight loss and reduced appetite, and more.\u00a0Some of these disorders include:\u00a0Inflammatory bowel disease, which is a broad term for any disease that causes irritation or inflammation of the intestines. The two most common are\u00a0 Crohn\u2019s disease, usually affecting the small intestine and ulcerative colitis which affects the large intestine.\u00a0Colon polyps which are growths on the interior of the colon that can lead to bleeding from the rectum and could be an early indicator of\u202fcolorectal cancer.\u00a0Functional bowel disorders, including constipation and irritable bowel syndrome (IBS) which is indicated by repeated pain in the abdomen, diarrhea, or constipation with these symptoms occurring together and consistently.\u00a0\u00a0Diverticular disease which is when small sacs form and push their way through weak points of the colon.Short bowel syndrome which typically occurs in people whom have had lengths of their intestines removed. This condition effects people by limiting the amount of nutrients they can absorb from their food.\u00a0\u00a0\u00a0Medical or Surgical Treatment of Intestinal Failure\u00a0While many intestinal diseases and conditions can be treated with medicines, lifestyle changes, and other therapies, some diseases may require an\u202fintestinal transplant. In the transplant, the diseased section of intestine is removed and replaced with a healthy donor\u2019s intestine. Although it is considered a major surgery, many patients are able to restore their normal diet. Your transplant team will talk with you about of all the risks and benefits of the surgery.\u00a0UPMC intestinal transplant teams offer a multidisciplinary approach making sure all aspects of your care are treated. For more information or to make an appointment please call\u202f412-647-5800\u202for visit the\u202fUPMC Transplant Services\u202fwebsite.\u00a0Editor's Note: This article was originally published on September 6, 2015, and was last reviewed on June 14, 2023."},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"2015","item":"https:\/\/share-dev.upmc.com\/2015\/#breadcrumbitem"},{"@type":"ListItem","position":2,"name":"09","item":"https:\/\/share-dev.upmc.com\/2015\/\/09\/#breadcrumbitem"},{"@type":"ListItem","position":3,"name":"What Are the Intestines?","item":"https:\/\/share-dev.upmc.com\/2015\/09\/what-do-intestines-do-for-the-body\/#breadcrumbitem"}]}]