{"id":2274,"date":"2025-07-09T16:28:05","date_gmt":"2025-07-09T14:28:05","guid":{"rendered":"https:\/\/mimatest.net\/?p=2274"},"modified":"2025-12-09T20:26:12","modified_gmt":"2025-12-09T19:26:12","slug":"ist-der-duenndarm-steril","status":"publish","type":"post","link":"https:\/\/mimatest.net\/en\/ist-der-duenndarm-steril\/","title":{"rendered":"Ist der D\u00fcnndarm steril?\u200b"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Die Vorstellung, dass der D\u00fcnndarm beim gesunden Menschen \u201ekeine Bakterienflora\u201c haben sollte und jede bakterielle Besiedlung dort pathologisch sei, gilt heute als \u00fcberholt. Dennoch wird diese Annahme in der medizinischen Ausbildung und Praxis weiterhin h\u00e4ufig gelehrt. Die Gr\u00fcnde daf\u00fcr sind historisch, methodisch und didaktisch bedingt.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Aktueller Stand der Wissenschaft<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Moderne Studien zeigen, dass der D\u00fcnndarm sehr wohl von Bakterien besiedelt ist, wenn auch in deutlich geringerer Dichte und mit anderer Zusammensetzung als der Dickdarm. Die Bakterienzahl und -arten im D\u00fcnndarm schwanken stark, etwa in Abh\u00e4ngigkeit vom Ern\u00e4hrungszustand: Nach einer Fastenperiode nimmt die Bakterienzahl ab, nach Nahrungsaufnahme steigt sie wieder an. Dennoch bleibt eine gewisse bakterielle Pr\u00e4senz bestehen, die als Teil eines dynamischen \u201e\u00d6kosystems\u201c betrachtet werden kann.<\/li>\n\n\n\n<li>Die D\u00fcnndarmflora ist also nicht steril, sondern zeichnet sich durch eine geringe und sehr variable Bakteriendichte aus, die sich rasch an Umweltbedingungen anpasst.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Warum wird dennoch gelehrt, der D\u00fcnndarm sei \u201ekeimfrei\u201c?<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Historische Lehrmeinung und Methodik:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lange Zeit war der D\u00fcnndarm mit klassischen mikrobiologischen Methoden schwer zug\u00e4nglich. Untersuchungen basieren meist auf Stuhlproben, die vor allem den Dickdarm repr\u00e4sentieren. Nur selten konnten Proben direkt aus dem D\u00fcnndarm gewonnen werden, meist nur im Rahmen von Operationen oder speziellen Eingriffen.<\/li>\n\n\n\n<li>Da die Bakteriendichte im D\u00fcnndarm viel geringer ist als im Dickdarm, wurde dies f\u00e4lschlicherweise als Sterilit\u00e4t interpretiert.<\/li>\n<\/ul>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>Diagnostische und therapeutische Vereinfachung:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In der klinischen Praxis wird die Diagnose \u201eD\u00fcnndarmfehlbesiedlung\u201c (SIBO) gestellt, wenn eine \u00fcberm\u00e4\u00dfige oder \u201efalsche\u201c Besiedlung des D\u00fcnndarms mit Bakterien, insbesondere Dickdarmbakterien, vorliegt. Zur Abgrenzung wird oft vereinfacht gelehrt, der D\u00fcnndarm sei normalerweise \u201ekeimfrei\u201c und jede bakterielle Pr\u00e4senz dort pathologisch.<\/li>\n\n\n\n<li>Diese Vereinfachung erleichtert die Kommunikation und das Verst\u00e4ndnis, ist aber wissenschaftlich nicht korrekt.<\/li>\n<\/ul>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>Fehlende Aktualisierung der Lehrb\u00fccher:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Medizinische Lehrb\u00fccher und Curricula werden oft nur langsam an neue wissenschaftliche Erkenntnisse angepasst. Viele aktuelle Erkenntnisse zur D\u00fcnndarmflora sind erst in den letzten Jahren durch moderne Sequenzierungsmethoden gewonnen worden.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Fazit<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Die Annahme, der D\u00fcnndarm sei beim gesunden Menschen steril, ist wissenschaftlich widerlegt. <\/strong>Der D\u00fcnndarm besitzt eine eigene, dynamische, aber niedrig dichte bakterielle Flora, die sich st\u00e4ndig anpasst. Die weiterhin verbreitete Lehre eines \u201ekeimfreien\u201c D\u00fcnndarms ist ein Relikt \u00e4lterer Forschungsmethoden und didaktischer Vereinfachung, das mit der modernen Mikrobiomforschung nicht mehr vereinbar ist.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/mt-portal.de\/aktuell\/neue-erkenntnisse-ueber-bakterien-des-menschlichen-duenndarms\/\">https:\/\/mt-portal.de\/aktuell\/neue-erkenntnisse-ueber-bakterien-des-menschlichen-duenndarms\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/flexikon.doccheck.com\/de\/Bakterielle_D%C3%BCnndarmfehlbesiedlung\">https:\/\/flexikon.doccheck.com\/de\/Bakterielle_D%C3%BCnndarmfehlbesiedlung<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cara.care\/de\/erkrankungen\/unterbauch\/duenndarmfehlbesiedlung\/\">https:\/\/cara.care\/de\/erkrankungen\/unterbauch\/duenndarmfehlbesiedlung\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ndr.de\/ratgeber\/gesundheit\/Duenndarmfehlbesiedlung-Symptome-und-Behandlung-bei-SIBO,duenndarmfehlbesiedlung100.html\">https:\/\/www.ndr.de\/ratgeber\/gesundheit\/Duenndarmfehlbesiedlung-Symptome-und-Behandlung-bei-SIBO,duenndarmfehlbesiedlung100.html<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/reposit.haw-hamburg.de\/bitstream\/20.500.12738\/8829\/1\/Ludewig_geschwaerzt.pdf\">https:\/\/reposit.haw-hamburg.de\/bitstream\/20.500.12738\/8829\/1\/Ludewig_geschwaerzt.pdf<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.springermedizin.de\/emedpedia\/detail\/dgim-innere-medizin\/bakterielle-fehlbesiedelung-des-duenndarms?epediaDoi=10.1007%2F978-3-642-54676-1_298\">https:\/\/www.springermedizin.de\/emedpedia\/detail\/dgim-innere-medizin\/bakterielle-fehlbesiedelung-des-duenndarms?epediaDoi=10.1007%2F978-3-642-54676-1_298<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.wolz.de\/magazin\/duenndarmfehlbesiedelung-sibo\">https:\/\/www.wolz.de\/magazin\/duenndarmfehlbesiedelung-sibo<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/drschwitalla.com\/diagnostik\/sibo\/\">https:\/\/drschwitalla.com\/diagnostik\/sibo\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.msdmanuals.com\/de\/heim\/kurzinformationen-verdauungsst%C3%B6rungen\/malabsorption\/d%C3%BCnndarmfehlbesiedlung\">https:\/\/www.msdmanuals.com\/de\/heim\/kurzinformationen-verdauungsst%C3%B6rungen\/malabsorption\/d%C3%BCnndarmfehlbesiedlung<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.helmholtz-hzi.de\/wissen\/wissensportal\/mikrobiom\/\">https:\/\/www.helmholtz-hzi.de\/wissen\/wissensportal\/mikrobiom\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mpg.de\/18500965\/W003_Biologie-Medizin_056-060.pdf\">https:\/\/www.mpg.de\/18500965\/W003_Biologie-Medizin_056-060.pdf<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ndr.de\/ratgeber\/gesundheit\/Probiotika-und-Praebiotika-Darmflora-aufbauen,darmgesundheit100.html\">https:\/\/www.ndr.de\/ratgeber\/gesundheit\/Probiotika-und-Praebiotika-Darmflora-aufbauen,darmgesundheit100.html<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.reizdarm-sibo.de\/sibo\/\">https:\/\/www.reizdarm-sibo.de\/sibo\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.dr-bacharach.de\/gut-zu-wissen\/sibo-das-verkannte-reizdarmsyndrom\">https:\/\/www.dr-bacharach.de\/gut-zu-wissen\/sibo-das-verkannte-reizdarmsyndrom<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.grvs.de\/download\/GRVS_band1_MorbusCrohn.pdf\">https:\/\/www.grvs.de\/download\/GRVS_band1_MorbusCrohn.pdf<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.dekade-gegen-krebs.de\/de\/wir-ueber-uns\/aktuelles-aus-der-dekade\/_documents\/frl-darmkrebs-mi-eocrc.html\">https:\/\/www.dekade-gegen-krebs.de\/de\/wir-ueber-uns\/aktuelles-aus-der-dekade\/_documents\/frl-darmkrebs-mi-eocrc.html<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.charite.de\/service\/pressemitteilung\/artikel\/detail\/nature_studie_wie_eine_diaet_die_darmflora_beeinflusst\">https:\/\/www.charite.de\/service\/pressemitteilung\/artikel\/detail\/nature_studie_wie_eine_diaet_die_darmflora_beeinflusst<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.deutschesgesundheitsportal.de\/2025\/03\/24\/duenndarmfehlbesiedelung-bei-ced-haeufig\/\">https:\/\/www.deutschesgesundheitsportal.de\/2025\/03\/24\/duenndarmfehlbesiedelung-bei-ced-haeufig\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.feg-fernstudium.de\/kurse\/kurs\/Fachkraft-fuer-Mikrobiom-und-Darmgesundheit-8341\/\">https:\/\/www.feg-fernstudium.de\/kurse\/kurs\/Fachkraft-fuer-Mikrobiom-und-Darmgesundheit-8341\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ndr.de\/ratgeber\/gesundheit\/Chat-Protokoll-Duenndarmfehlbesiedlung-SIBO,chatprotokollandresen108.html\">https:\/\/www.ndr.de\/ratgeber\/gesundheit\/Chat-Protokoll-Duenndarmfehlbesiedlung-SIBO,chatprotokollandresen108.html<\/a><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Die Vorstellung, dass der D\u00fcnndarm beim gesunden Menschen \u201ekeine Bakterienflora\u201c haben sollte und jede bakterielle Besiedlung dort pathologisch sei, gilt [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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