Abstract
Colorectal cancer (CRC) is one of the most common malignancies and the second leading cause of cancer-related death worldwide. Early-onset CRC (EOCRC), diagnosed in adults under the age of 50 years, has emerged as a pressing public health concern owing to its alarming rise in incidence since the 1990s. This trend, observed in the USA and at least eight other high-income countries, starkly contrasts with the declining incidence rates of late-onset CRC (age 50 years and above), largely attributed to early disease detection and lifestyle changes. Concurrent with the rising number of cases of EOCRC, the burden of metabolic diseases, particularly obesity and type 2 diabetes mellitus (T2DM), has surged among young populations. Despite well-documented links between metabolic dysfunction and late-onset CRC, understanding the precise role of obesity and T2DM in the pathogenesis of EOCRC remains in its infancy. This narrative Review synthesizes evidence on the relationship of obesity and T2DM with EOCRC, focusing on pathophysiological mechanisms and the mediating roles of diet and lifestyle factors. It also discusses potential clinical and public health strategies to address obesity and T2DM for EOCRC prevention, highlighting knowledge gaps and future research directions.
Key points
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The incidence of early-onset colorectal cancer (EOCRC) is increasing globally, particularly in high-income countries, aligning with rising obesity and type 2 diabetes mellitus (T2DM) rates among young adults.
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Obesity and T2DM could contribute to EOCRC through insulin resistance and/or hyperinsulinaemia, chronic inflammation and altered gut microbiome, which create a pro-tumorigenic environment that accelerates colorectal carcinogenesis.
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Western diets high in ultra-processed foods, refined sugars and saturated fats exacerbate obesity, T2DM and EOCRC risk by disrupting insulin signalling, promoting chronic inflammation and altering the gut microbiome.
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Current colorectal cancer screening guidelines might miss young adults at high risk; integrating metabolic factors, microbiome biomarkers and lifestyle data could improve individual risk assessments for EOCRC.
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Tailored dietary programmes, physical activity, glucagon-like peptide 1 receptor agonists and metformin show potential for reducing EOCRC risk, although long-term efficacy and mechanisms require further study.
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Multi-omics profiling, mechanistic studies and randomized controlled trials focusing on age-specific metabolic pathways, microbial signatures and socioenvironmental factors are essential for targeted EOCRC prevention.
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Acknowledgements
The authors acknowledge support to the PROSPECT team of the Cancer Grand Challenges partnership funded by Cancer Research UK (CGCATF-2023/100037 to Y.C.; CGCATF-2023/100036 to A.T.C.), the National Cancer Institute (OT2CA297576 to Y.C.; OT2CA297680 to A.T.C.), the Bowelbabe Fund for Cancer Research UK and Institut National Du Cancer. The support of this work by R35CA253185 (A.T.C.), R37CA246175 (Y.C.), R01CA258697 (M.D.G.), and K00CA274714 and K99CA297022 (M.D.) from the National Cancer Institute; R01DK132427 (M.D.G.) and K01DK120742 (D.A.D.) from the National Institute of Diabetes and Digestive and Kidney Diseases are also acknowledged.
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M.D. researched data for the article and wrote the article. M.D. and A.T.C. contributed substantially to discussion of the content. All authors reviewed and/or edited the manuscript before submission.
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M.D.G. holds equity in Faeth Therapeutics and Skye Biosciences; reports consulting or advisory roles with Almac Discovery, Genentech Inc., Faeth Therapeutics, Scorpion Therapeutics and Skye Biosciences; and patents, royalties and other intellectual property with Weill Cornell Medicine and Faeth Therapeutics. Y.C. has served as a consultant for Need Inc. and Geneocopy Inc. A.T.C. serves as a consultant for Pfizer Inc. and Boehringer Ingelheim. All of the above disclosures are outside of the submitted work. The other authors declare no competing interests.
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Du, M., Drew, D.A., Goncalves, M.D. et al. Early-onset colorectal cancer as an emerging disease of metabolic dysregulation. Nat Rev Endocrinol 21, 686–702 (2025). https://doi.org/10.1038/s41574-025-01159-z
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DOI: https://doi.org/10.1038/s41574-025-01159-z