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Diet studies often rely on stool samples. That\u2019s helpful, but it doesn\u2019t always reflect the bacteria that stick to the gut wall. <\/p>\n
This project looked at those wall-attached microbes<\/a>, which sit directly against our tissues. The goal was straightforward: see whether everyday dairy habits show up in that community of bacteria.<\/p>\n Understanding the microbiome<\/p>\n Think of your gut microbiome as a bustling neighborhood of trillions of microbes<\/a> \u2013 mostly bacteria, plus some fungi and viruses \u2013 that live mainly in your large intestine. <\/p>\n They help break down parts of food you can\u2019t digest on your own, especially fiber, producing short-chain fatty acids like butyrate that feed your colon cells and help keep inflammation in check. <\/p>\n These microbes also train your immune system, make certain vitamins, and interact with your nervous system through chemical signals. That\u2019s where we get the term \u201cgut feeling.\u201d <\/p>\n Everyone\u2019s microbiome is a little different, shaped by birth, diet, environment, sleep, stress, and medicines like antibiotics. <\/p>\n Diversity tends to be a good sign: a wider variety of species usually means a more stable, resilient community.<\/p>\n There\u2019s no single \u201cperfect\u201d microbiome, but you can nudge yours in a healthy direction<\/a> with balanced meals, regular movement, enough sleep, and cautious antibiotic use when medically needed.<\/p>\n Learning how dairy shapes gut bacteria<\/p>\n Adults undergoing routine colonoscopies at a veterans\u2019 hospital in Houston participated. Their colons appeared normal, and none had major conditions<\/a> that could confound the results. <\/p>\n During the procedure, doctors collected pinhead-sized biopsies from the colon lining for lab analysis.<\/p>\n In total, the team analyzed 97 biopsies from 34 people. Beforehand, participants completed a food questionnaire that covered the past year, including milk, cheese, yogurt<\/a>, and total dairy intake. <\/p>\n In the lab, the group used 16S rRNA sequencing to identify which bacteria were present and in what amounts.<\/p>\n Two basic yardsticks apply. \u201cAlpha diversity\u201d refers to how many kinds of bacteria are in a single sample. \u201cBeta diversity\u201d compares how different two people\u2019s communities are.<\/p>\n The analysis adjusted for age, body size, smoking, alcohol use, health conditions, overall diet quality, and which part of the colon the sample came from. That helps separate signals that are likely true associations from those created by other factors.<\/p>\n What the scientists learned<\/p>\n People who drank more milk<\/a> \u2013 and those who consumed more total dairy \u2013 tended to have higher alpha diversity in the bacteria attached to the colon lining. <\/p>\n Beta diversity also differed between higher and lower consumers of total dairy, milk, cheese, and yogurt, indicating that intake patterns were associated with broader shifts in community structure.<\/p>\n Two familiar bacteria stood out. Faecalibacterium<\/a> is often considered beneficial because it makes butyrate, a short-chain fatty acid that fuels colon cells and can calm inflammation. People who consumed more total dairy and more milk had more Faecalibacterium on the colon lining. <\/p>\n Akkermansia<\/a>, frequently linked to a strong gut barrier and better metabolic markers, also appeared at higher levels with milk intake.<\/p>\n Dairy products and bacteria<\/p>\n When the team accounted for dietary lactose, the milk-microbe links weakened. That points to lactose as a possible prebiotic<\/a> \u2013 food for specific bacteria \u2013 that may help certain microbes grow. <\/p>\n It also fits a simple nutrition fact: milk contains lactose, while many hard cheeses have very little.<\/p>\n Cheese didn\u2019t follow milk\u2019s pattern. Higher cheese intake was associated with lower amounts of certain bacteria in adjusted models, including Bacteroides<\/a> and Subdoligranulum. <\/p>\n Scientists don\u2019t treat Bacteroides as purely good or bad; it depends on the species and context. <\/p>\n Subdoligranulum<\/a> can produce butyrate, which is usually beneficial, so seeing lower levels with higher cheese intake raises questions about which cheese components might shift the balance. Turning milk into cheese changes nutrients in ways that could matter.<\/p>\n Yogurt intake here was very low on average \u2013 approximately a few sips per day \u2013 so the study couldn\u2019t draw firm conclusions. <\/p>\n The researchers didn\u2019t see clear links between yogurt and diversity, and classic yogurt cultures like Lactobacillus<\/a> and Bifidobacterium<\/a> appeared at very low levels on the colon lining in these samples.<\/p>\n Colon lining yields clues<\/p>\n Most data we see come from stool samples, which reflect what exits the body. The mucosa \u2013 the gut\u2019s surface \u2013 can look different. <\/p>\n Studying the wall-attached community gives a closer view of the microbes that interact with the gut barrier and immune cells. It reflects the mucosal surface rather than only what is present in stool.<\/p>\n Gut bacteria, dairy, and health<\/p>\n If you tolerate dairy and already drink milk, your gut\u2019s surface community<\/a> may be more diverse. <\/p>\n If cheese is your main dairy, the effects likely depend on the type of cheese, your overall diet \u2013 especially fiber \u2013 and your individual microbiome. <\/p>\n If you don\u2019t tolerate lactose well, prebiotic fibers from beans, oats, bananas, onions, and asparagus can nourish beneficial bacteria by another route.<\/p>\n Different dairy foods appear to influence the gut\u2019s wall-attached community in distinct ways. <\/p>\n Larger, longer studies in more diverse groups will help test which dairy components do what, and for whom. For now, what goes in your glass and on your plate shows up in your gut in measurable ways.<\/p>\n The full study was published in the journal Nutrients<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Most of us have heard that the gut is full of bacteria that help with digestion, immunity, and…\n","protected":false},"author":2,"featured_media":369912,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[105,16,15],"class_list":{"0":"post-369911","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-health","8":"tag-health","9":"tag-uk","10":"tag-united-kingdom"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@uk\/115084190449632439","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts\/369911","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/comments?post=369911"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/posts\/369911\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/media\/369912"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/media?parent=369911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/categories?post=369911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/uk\/wp-json\/wp\/v2\/tags?post=369911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}