{"id":4350,"date":"2025-11-13T17:05:21","date_gmt":"2025-11-13T17:05:21","guid":{"rendered":"https:\/\/readtrends.com\/en\/ultra-processed-foods-adenoma-risk\/"},"modified":"2025-11-13T17:05:21","modified_gmt":"2025-11-13T17:05:21","slug":"ultra-processed-foods-adenoma-risk","status":"publish","type":"post","link":"https:\/\/readtrends.com\/en\/ultra-processed-foods-adenoma-risk\/","title":{"rendered":"Ultra-processed foods tied to higher risk of precancerous colorectal polyps in young women"},"content":{"rendered":"<article>\n<h2>Lead<\/h2>\n<p>A study published Thursday in JAMA Oncology found that higher consumption of ultra\u2011processed foods is associated with an increased risk of precancerous colorectal adenomas in women under 50. Researchers analyzed data from more than 29,000 participants in the Nurses&#8217; Health Study II and followed them from 1991 through 2015. Women who derived about one\u2011third of daily calories from ultra\u2011processed foods were roughly 1.5 times more likely to develop adenomas before age 50 than those who ate the fewest. The pattern was specific to adenomas; the study did not find a similar link for serrated lesions.<\/p>\n<h2>Key Takeaways<\/h2>\n<ul>\n<li>Study cohort: Data from 29,168 women in the Nurses&#8217; Health Study II, enrolled 1989 (ages 24\u201342), followed 1991\u20132015 with diet questionnaires every four years.<\/li>\n<li>Outcome: About 1,200 women developed adenomas; those in the highest ultra\u2011processed food intake group (~one\u2011third of calories) had ~1.5\u00d7 the risk compared with the lowest intake group.<\/li>\n<li>Lesion types: The association was observed for adenomas (the lesion type that underlies most colorectal cancers) but not for serrated lesions.<\/li>\n<li>Food categories: Diets higher in sugar and artificial sweeteners showed the strongest association, followed by higher intake of sauces, spreads and condiments.<\/li>\n<li>Population limits: The analysis included only women, the majority identifying as white; authors note further study is needed in men and more diverse populations.<\/li>\n<li>Public health context: Colorectal cancer rates have risen markedly in people under 50; routine screening typically begins at age 45, leaving younger adults less likely to be screened.<\/li>\n<\/ul>\n<h2>Background<\/h2>\n<p>Colorectal cancer incidence in adults younger than 50 has increased substantially over recent decades, prompting researchers to search for environmental and lifestyle drivers beyond genetics. Ultra\u2011processed foods \u2014 convenience items defined by multiple industrial processing steps and additives \u2014 now represent a large share of calories in many Western diets, particularly among children and younger adults. Prior research has linked these products to higher rates of obesity, type 2 diabetes, depression and premature mortality, raising concern they could also contribute to early\u2011onset colorectal disease.<\/p>\n<p>The Nurses&#8217; Health Study II is a long\u2011running prospective cohort established in 1989 to track health outcomes in female registered nurses. Detailed diet questionnaires administered every four years allowed investigators to estimate the share of calories from ultra\u2011processed foods and relate that exposure to pathology found at colonoscopy. Because most colorectal cancers develop from adenomas, studying precancerous polyps provides an early indicator of cancer risk pathways.<\/p>\n<h2>Main Event<\/h2>\n<p>Investigators categorized participants by the proportion of daily calories coming from ultra\u2011processed foods and tracked diagnoses of two types of precancerous colorectal lesions: adenomas and serrated lesions. All participants had at least one colonoscopy before the age of 50, which enabled lesion detection prior to routine screening ages. Approximately 1,200 women were diagnosed with adenomas during follow\u2011up; statistical models adjusted for known confounders showed a clear positive association between higher ultra\u2011processed food intake and adenoma risk.<\/p>\n<p>The increased risk concentrated in women whose diets derived about one\u2011third of calories from ultra\u2011processed items. The study identified specific subcategories \u2014 diets high in sugars and artificial sweeteners, and higher consumption of sauces, spreads and condiments \u2014 as most strongly associated with adenoma occurrence. By contrast, researchers did not observe a meaningful relationship between ultra\u2011processed food intake and serrated lesions in the same cohort.<\/p>\n<p>Lead author Dr. Andrew Chan and colleagues interpreted the adenoma\u2011specific finding as potentially important because most colorectal cancers arise from adenomatous polyps. Experts not involved in the work emphasized the clinical importance of polyp detection and removal, while noting that many younger adults are not routinely screened and might carry undetected lesions for years.<\/p>\n<h2>Analysis &#038; Implications<\/h2>\n<p>The observational nature of the study means causality cannot be established from these results alone. Nonetheless, the magnitude and specificity of the association \u2014 focused on adenomas rather than all lesion types \u2014 strengthen the plausibility of a diet\u2011related effect on early colorectal carcinogenesis. Potential biological pathways include increased gut inflammation, alterations to the gut microbiome, and metabolic effects mediated by obesity or type 2 diabetes, all of which have been tied to colorectal neoplasia in prior studies.<\/p>\n<p>If ultra\u2011processed foods do contribute to adenoma formation, the public health implications could be considerable given the rapid rise in their consumption over recent decades. Messaging that reduces intake of high\u2011sugar, artificially sweetened and highly processed condiment\u2011heavy diets could form one part of a prevention strategy, alongside efforts to address obesity and metabolic disease. However, policymakers and clinicians will need stronger causal evidence \u2014 from mechanistic studies and intervention trials \u2014 before recommending specific regulatory or clinical actions.<\/p>\n<p>Clinically, the study underlines a gap in current screening practices: routine population screening historically began later in life and only recently moved toward age 45, leaving younger adults less likely to have lesions detected early. In the near term, the findings may prompt clinicians to counsel higher\u2011risk younger patients about diet and consider earlier diagnostic evaluation when symptoms or risk factors are present.<\/p>\n<h2>Comparison &#038; Data<\/h2>\n<figure>\n<table>\n<thead>\n<tr>\n<th>Measure<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cohort size<\/td>\n<td>29,168 women<\/td>\n<\/tr>\n<tr>\n<td>Follow\u2011up period<\/td>\n<td>1991\u20132015 (24 years)<\/td>\n<\/tr>\n<tr>\n<td>Adenoma cases<\/td>\n<td>~1,200<\/td>\n<\/tr>\n<tr>\n<td>Highest UPF share (approx.)<\/td>\n<td>~1\/3 of daily calories<\/td>\n<\/tr>\n<tr>\n<td>Relative risk (highest vs lowest)<\/td>\n<td>~1.5\u00d7 for adenomas<\/td>\n<\/tr>\n<tr>\n<td>Lesion with no observed association<\/td>\n<td>Serrated lesions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p>The table summarizes key numerical findings reported by the authors. The relative risk figure (~1.5\u00d7) comes from comparisons between participants with the highest versus lowest reported shares of ultra\u2011processed foods in their diets; models accounted for multiple demographic and lifestyle covariates. Readers should note that exact effect sizes can vary across analytic models and after different adjustments, so the table presents rounded, study\u2011reported values for clarity.<\/p>\n<h2>Reactions &#038; Quotes<\/h2>\n<p>Outside experts welcomed the study&#8217;s focus on a plausible, modifiable exposure but urged caution in interpretation.<\/p>\n<blockquote>\n<p>&#8220;One approach we\u2019ve been taking is trying to understand what has changed in our environment that could be driving this,&#8221;<\/p>\n<p><cite>Dr. Andrew Chan, Massachusetts General Brigham (study lead)<\/cite><\/p><\/blockquote>\n<p>Chan framed the research as part of a broader effort to identify environmental trends that mirror the rise in early\u2011onset colorectal cancer, noting the parallel increase in ultra\u2011processed food consumption.<\/p>\n<blockquote>\n<p>&#8220;They are looking at the first step, who is more likely to get these polyps that can turn into cancer,&#8221;<\/p>\n<p><cite>Dr. Folasade May, UCLA (gastroenterologist, not involved)<\/cite><\/p><\/blockquote>\n<p>Dr. May highlighted the clinical importance of adenomas as precursors to most colorectal cancers and explained why identifying upstream risk factors is important for prevention.<\/p>\n<blockquote>\n<p>&#8220;The concern is that whenever you have a polyp in a young person, that polyp is allowed to grow unnoticed,&#8221;<\/p>\n<p><cite>Dr. Christopher Lieu, University of Colorado (oncologist, not involved)<\/cite><\/p><\/blockquote>\n<p>Lieu emphasized the screening gap for younger adults and why modifiable lifestyle factors deserve attention while research on causality continues.<\/p>\n<aside>\n<details>\n<summary>Explainer: key terms and methods<\/summary>\n<p>Ultra\u2011processed foods: industrially formulated products with multiple ingredients and additives, often high in refined sugars, unhealthy fats and salts. Adenomas: types of colorectal polyps with a higher likelihood of progressing to cancer over time. Serrated lesions: a different polyp type that can be precancerous but has a distinct biology and lower prevalence as a precursor to colorectal cancer. Relative risk: a ratio comparing the probability of an outcome (here, adenoma) between exposed and unexposed groups. Gut microbiome: the community of microbes in the digestive tract which can be altered by diet and influence inflammation and cancer risk. Prospective cohort methods: researchers follow participants over time, collecting exposure data before the outcome occurs, which reduces certain biases but cannot alone prove causation.<\/p>\n<\/details>\n<\/aside>\n<h2>Unconfirmed<\/h2>\n<ul>\n<li>Whether the observed association reflects a direct causal effect of ultra\u2011processed foods on adenoma formation rather than residual confounding \u2014 this study is observational and cannot prove causality.<\/li>\n<li>Generalizability to men and more racially and socioeconomically diverse populations \u2014 the cohort consisted only of women, predominantly white.<\/li>\n<li>The precise biological mechanism (microbiome alteration vs inflammation vs metabolic effects) linking ultra\u2011processed foods to adenoma development remains unproven and requires targeted mechanistic studies.<\/li>\n<\/ul>\n<h2>Bottom Line<\/h2>\n<p>This prospective analysis adds weight to concerns that rising consumption of ultra\u2011processed foods may be one contributor to increasing colorectal neoplasia in younger adults, specifically through a higher risk of adenoma formation. The effect size \u2014 about a 50% higher risk for those consuming roughly one\u2011third of calories from ultra\u2011processed sources \u2014 is notable but not definitive proof of causation.<\/p>\n<p>For clinicians and public\u2011health officials, the work supports advising patients to limit highly processed, sugar\u2011heavy and artificially sweetened products as part of broader strategies to reduce metabolic risk. For researchers, the study points to next steps: replicate findings in men and diverse cohorts, pursue mechanism\u2011focused laboratory and microbiome research, and evaluate whether reducing ultra\u2011processed food intake lowers adenoma or cancer risk in intervention trials.<\/p>\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.nbcnews.com\/health\/cancer\/ultra-processed-foods-linked-increased-risk-precancerous-polyps-study-rcna243574\" target=\"_blank\" rel=\"noopener\">NBC News \u2014 reporting on the JAMA Oncology study<\/a> (media)<\/li>\n<li><a href=\"https:\/\/jamanetwork.com\/journals\/jamaoncology\" target=\"_blank\" rel=\"noopener\">JAMA Oncology<\/a> (peer\u2011reviewed medical journal; study published in this journal)<\/li>\n<li><a href=\"https:\/\/www.nurseshealthstudy.org\" target=\"_blank\" rel=\"noopener\">Nurses&#8217; Health Study II<\/a> (academic cohort; long\u2011term epidemiologic study)<\/li>\n<li><a href=\"https:\/\/my.clevelandclinic.org\/health\/diseases\/17955-colorectal-cancer\" target=\"_blank\" rel=\"noopener\">Cleveland Clinic \u2014 colorectal polyps and adenomas<\/a> (clinical reference)<\/li>\n<\/ul>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Lead A study published Thursday in JAMA Oncology found that higher consumption of ultra\u2011processed foods is associated with an increased risk of precancerous colorectal adenomas in women under 50. Researchers analyzed data from more than 29,000 participants in the Nurses&#8217; Health Study II and followed them from 1991 through 2015. Women who derived about one\u2011third &#8230; <a title=\"Ultra-processed foods tied to higher risk of precancerous colorectal polyps in young women\" class=\"read-more\" href=\"https:\/\/readtrends.com\/en\/ultra-processed-foods-adenoma-risk\/\" aria-label=\"Read more about Ultra-processed foods tied to higher risk of precancerous colorectal polyps in young women\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":4345,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rank_math_title":"Ultra-processed foods linked to adenoma risk \u2014 DeepHealth","rank_math_description":"A JAMA Oncology analysis of 29,000+ women links higher ultra\u2011processed food intake to a 1.5\u00d7 increase in precancerous colorectal adenomas before age 50.","rank_math_focus_keyword":"ultra-processed foods,adenomas,colorectal polyps,colorectal cancer,microbiome","footnotes":""},"categories":[2],"tags":[],"class_list":["post-4350","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-top-stories"],"_links":{"self":[{"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/posts\/4350","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/comments?post=4350"}],"version-history":[{"count":0,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/posts\/4350\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/media\/4345"}],"wp:attachment":[{"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/media?parent=4350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/categories?post=4350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/readtrends.com\/en\/wp-json\/wp\/v2\/tags?post=4350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}