{"id":800511,"date":"2026-03-23T12:45:46","date_gmt":"2026-03-23T12:45:46","guid":{"rendered":"https:\/\/www.nahrungsmittel-intoleranz.com\/but-microbiome-tests-do-work\/"},"modified":"2026-04-09T19:22:50","modified_gmt":"2026-04-09T19:22:50","slug":"but-microbiome-tests-do-work","status":"publish","type":"post","link":"https:\/\/www.nahrungsmittel-intoleranz.com\/en\/but-microbiome-tests-do-work\/","title":{"rendered":"But microbiome tests do work!"},"content":{"rendered":"\n<p>Many people report that a <strong>gut flora home test<\/strong> or <strong>microbiome test<\/strong> has helped them. Some consultants also say: <\/p>\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>&#8220;I have been working with these tests for years and regularly see improvements.&#8221;<\/p>\n<\/blockquote>\n\n<p>The first part of this series dealt with how <strong>microbiome tests work technically<\/strong> and why their informative value can be limited. This second part deals with a different question: <strong>Why are gut flora tests often so convincing &#8211; even if their diagnostic value is limited?<\/strong> <\/p>\n\n<p>The explanation often lies in a combination of <strong>statistical effects, psychological mechanisms and general lifestyle changes<\/strong>.<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\" id=\"h-viele-variablen-irgendetwas-passt-immer\">Many variables &#8211; something always fits.<\/h2>\n\n<p>A typical <strong>gut flora report<\/strong> often contains:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Dozens or even hundreds of bacteria groups<\/li>\n\n\n\n<li>Various scores or rankings<\/li>\n\n\n\n<li>Comparisons with reference populations<\/li>\n<\/ul>\n\n<p>Statistically, it is very likely that some of these values will appear conspicuous or seem to match individual complaints. For example, if a report assesses 80 microorganisms, it is hardly surprising that some of them fall outside an average range. In scientific studies, this issue is addressed through large samples and statistical models (Knight et al., 2018). This is much more difficult with individual home tests.   <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\" id=\"h-breite-interpretationsspielraume\">Wide scope for interpretation<\/h2>\n\n<p>Many <strong>microbiome reports<\/strong> use formulations such as:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>&#8220;could be associated with inflammation&#8221;<\/li>\n\n\n\n<li>&#8220;is associated with digestive problems in some studies&#8221;<\/li>\n\n\n\n<li>&#8220;can be influenced by diet&#8221;<\/li>\n<\/ul>\n\n<p>Such statements are scientifically correct, but often <strong>formulated in very general terms<\/strong>. As a result, they can apply to many situations and easily create the impression of a precise diagnosis. <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\" id=\"h-normbereiche-aus-durchschnittsdaten\">Standard ranges from average data<\/h2>\n\n<p>Many providers compare their own microbiome with a reference population. The problem: even among healthy people, microbiomes differ greatly. The <strong>Human Microbiome Project<\/strong> has already shown that the composition of the gut microbiome can vary considerably between healthy people (Human Microbiome Project Consortium, 2012). A value outside an average range therefore does not automatically mean that something is pathological.   <\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-regression-zur-mitte\">Regression to the center<\/h2>\n\n<p>Another significant effect is the so-called <strong>regression to the center<\/strong>. Many people have tests carried out when their symptoms are particularly severe. Statistically, it is likely that the symptoms will improve again afterwards &#8211; regardless of any intervention. If a measure is subsequently recommended, the natural improvement can easily be attributed to this intervention.   <\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-confirmation-bias\">Confirmation bias<\/h2>\n\n<p>Another psychological effect is the <strong>confirmation bias<\/strong>. People tend to pay more attention to information that confirms their expectations. Contradictory information, on the other hand, is often given less attention. If a microbiome report provides a plausible explanation (&#8220;This bacterium could be related to your symptoms&#8221;), this information is particularly memorable. Especially when consultants &#8211; experts to whom you pay money, after all &#8211; explain and confirm this.    <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\" id=\"h-lebensstilanderungen-nach-dem-mikrobiomtest\">Lifestyle changes after the microbiome test<\/h2>\n\n<p>After a gut flora test, many people change several aspects of their lifestyle at the same time:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>more fiber<\/li>\n\n\n\n<li>less ultra-processed food<\/li>\n\n\n\n<li>more movement<\/li>\n\n\n\n<li>More conscious eating behavior<\/li>\n<\/ul>\n\n<p>These changes have been well studied and can actually improve digestion. Diet can change the gut microbiome within just a few days (David et al., 2014). However, if symptoms improve as a result, the effect is easily attributed to the test. Incidentally, very few people stick to such changes for long and revert to their old diet after 3-6 months. Then they do another microbiome test and the game starts all over again.    <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\" id=\"h-warum-berater-innen-ehrlich-glauben-konnen-dass-darmflora-tests-funktionieren\">Why consultants can honestly believe that gut flora tests work<\/h2>\n\n<p>Many therapists report positive experiences with <strong>microbiome tests<\/strong>. This assessment is not necessarily dishonest. Several factors can contribute to this.  <\/p>\n\n<h3 class=\"wp-block-heading\" id=\"h-selektive-wahrnehmung\">Selective perception<\/h3>\n\n<p>In practice, particularly successful cases are remembered. Cases without a visible effect, on the other hand, are remembered less strongly. This effect is described in psychology as <strong>selective perception<\/strong>.  <\/p>\n\n<h3 class=\"wp-block-heading\" id=\"h-komplexe-interventionen\">Complex interventions<\/h3>\n\n<p>After a test, more than one measure is usually implemented. Several recommendations often follow at the same time: <\/p>\n\n<ul class=\"wp-block-list\">\n<li>Change of diet<\/li>\n\n\n\n<li>Probiotics<\/li>\n\n\n\n<li>Prebiotics<\/li>\n\n\n\n<li>Stress reduction<\/li>\n<\/ul>\n\n<p>If complaints improve, it is difficult to identify <strong>which measure was actually responsible<\/strong>.<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\" id=\"h-warum-mikrobiom-reports-so-uberzeugend-wirken\">Why microbiome reports are so convincing<\/h2>\n\n<p>In addition to psychological effects, the design of many reports also plays a role.<\/p>\n\n<h3 class=\"wp-block-heading\" id=\"h-viele-daten-erzeugen-vertrauen\">Lots of data generates trust<\/h3>\n\n<p>Microbiome reports often contain numerous diagrams and rankings. These visualizations give the impression of a very precise analysis. In fact, many of these visualizations are based on <strong>relative frequencies and statistical comparisons<\/strong>, not clinical thresholds.  <\/p>\n\n<h3 class=\"wp-block-heading\" id=\"h-personalisierte-sprache\">Personalized language<\/h3>\n\n<p>Many reports use formulations such as:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>&#8220;Your microbiome shows &#8230;&#8221;<\/li>\n\n\n\n<li>&#8220;Your gut type is &#8230;&#8221;<\/li>\n\n\n\n<li>&#8220;The following diet could be useful for you &#8230;&#8221;<\/li>\n<\/ul>\n\n<p>This language easily gives the impression of an individualized medical assessment.<\/p>\n\n<h3 class=\"wp-block-heading\" id=\"h-wissenschaftliche-referenzen\">Scientific references<\/h3>\n\n<p>Many providers refer to scientific studies. These studies are often real, but usually refer to <strong>populations or statistical correlations<\/strong>, not individual diagnoses. The difference between <strong>association and individual diagnosis<\/strong> is not always easy for readers to recognize. Actually never.   <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"h-warum-darmflora-tests-uberzeugend-wirken\">Why intestinal flora tests are convincing<\/h1>\n\n<p>Intestinal flora home tests can provide fascinating insights into the world of intestinal bacteria. However, many of the compelling elements do not necessarily come from precise medical diagnostics. <\/p>\n\n<p>A combination of<\/p>\n\n<ul class=\"wp-block-list\">\n<li>statistical effects<\/li>\n\n\n\n<li>broad interpretations<\/li>\n\n\n\n<li>Lifestyle changes<\/li>\n\n\n\n<li>psychological perception mechanisms<\/li>\n<\/ul>\n\n<p>can make tests appear very plausible &#8211; and sometimes even contribute to improvements. However, this does not automatically mean that the microbiome analysis itself was the cause of these improvements. <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h1 class=\"wp-block-heading\" id=\"h-faq-haufige-fragen-zu-darmflora-heimtests\">FAQ &#8211; Frequently asked questions about intestinal flora home tests<\/h1>\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1773751193902\"><strong class=\"schema-faq-question\">Are intestinal flora home tests scientifically meaningful?<\/strong> <p class=\"schema-faq-answer\">The underlying sequencing methods originate from microbiome research. However, their informative value for individual medical diagnoses is currently limited. <\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773751204449\"><strong class=\"schema-faq-question\">Why are microbiome tests often convincing?<\/strong> <p class=\"schema-faq-answer\">Microbiome reports contain many data points and a wide range of interpretations. At the same time, many people change their lifestyle after the test, which can lead to real improvements. <\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773751205115\"><strong class=\"schema-faq-question\">Can intestinal flora tests detect diseases?<\/strong> <p class=\"schema-faq-answer\">Currently not reliable. Most microbiome studies provide statistical correlations at population level, not diagnostic threshold values for individual persons. <\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773751205731\"><strong class=\"schema-faq-question\">Why do many people report improvements?<\/strong> <p class=\"schema-faq-answer\">Improvements can result from dietary changes, more attention to one&#8217;s own lifestyle or natural fluctuations in symptoms.<\/p> <\/div> <\/div>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h3 class=\"wp-block-heading\" id=\"h-literatur\">Literature<\/h3>\n\n<p class=\"has-small-font-size\">David, L. A., Maurice, C. F., Carmody, R. N., et al. (2014). Diet rapidly and reproducibly alters the human gut microbiome. <em>Nature<\/em>, 505, 559-563. <a href=\"https:\/\/doi.org\/10.1038\/nature12820\">https:\/\/doi.org\/10.1038\/nature12820<\/a><\/p>\n\n<p class=\"has-small-font-size\">Human Microbiome Project Consortium. (2012). Structure, function and diversity of the healthy human microbiome. <em>Nature<\/em>, 486, 207-214. <a href=\"https:\/\/doi.org\/10.1038\/nature11234\">https:\/\/doi.org\/10.1038\/nature11234<\/a><\/p>\n\n<p class=\"has-small-font-size\">Knight, R., Vrbanac, A., Taylor, B. C., et al. (2018). Best practices for analyzing microbiomes. <em>Nature Reviews Microbiology<\/em>, 16(7), 410-422. <a href=\"https:\/\/doi.org\/10.1038\/s41579-018-0029-9\">https:\/\/doi.org\/10.1038\/s41579-018-0029-9<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Many people report that a gut flora home test or microbiome test has helped them. Some consultants also say: &#8220;I have been working with these tests for years and regularly see improvements.&#8221; The first part of this series dealt with how microbiome tests work technically and why their informative value can be limited. This second [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":800513,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","wprm-recipe-roundup-name":"","wprm-recipe-roundup-description":"","footnotes":""},"categories":[197,251,202],"tags":[],"class_list":["post-800511","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured-stories-en","category-intestinal-health","category-investigations"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>But microbiome tests do work! Or? nmi-Portal \u2013 Ern\u00e4hrung im Fokus<\/title>\n<meta name=\"description\" content=\"Microbiome test explained: Why do the results often seem convincing, although their significance is limited? 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