The gut-liver axis: connecting carotenoids to non-alcoholic fatty liver disease prevention—a promising pathway for future research

I am writing to express my keen interest in the recently published article by Yan et al. (1). This study provides valuable insights into the complex interplay between serum carotenoids, gut microbiota, and non-alcoholic fatty liver disease (NAFLD), highlighting the importance of the gut-liver axis in metabolic health.

The findings of this study are particularly intriguing. By following a cohort over 7.8 years, the researchers were able to demonstrate that higher levels of serum carotenoids, particularly lycopene and β-carotene, were associated with a lower incidence of NAFLD. This association was further mediated through the gut microbiota, suggesting that the gut-liver axis plays a crucial role in modulating the relationship between dietary carotenoids and liver health. Specifically, the study identified specific gut microbiota taxa that were associated with both serum carotenoids and NAFLD, providing a mechanistic link between diet, gut microbiota, and liver metabolism.

This study has several important implications. First, it underscores the potential protective role of carotenoids in the prevention of NAFLD. Given the increasing prevalence of NAFLD worldwide, identifying modifiable dietary factors is of great public health significance. The findings suggest that dietary interventions rich in carotenoids, such as increased consumption of fruits and vegetables, could be a viable strategy for reducing the risk of NAFLD.

Second, the study highlights the importance of the gut microbiota in mediating the effects of diet on liver health. The gut microbiota has emerged as a key player in various metabolic processes, and this study adds to the growing body of evidence linking gut microbiota composition to liver diseases. By identifying specific microbial taxa associated with serum carotenoids and NAFLD, the study provides potential targets for future therapeutic interventions, such as probiotics or prebiotics, aimed at modulating the gut microbiota to improve liver health.

However, there are also some limitations to consider. The study relied on observational data, which limits the ability to establish causality. While the prospective design strengthens the temporal relationship between serum carotenoids and NAFLD, further randomized controlled trials are needed to confirm the causal effects of carotenoid intake on NAFLD risk. Additionally, the study focused on a specific population, and the findings may not be generalizable to other ethnic or demographic groups (2).

In conclusion, this study provides compelling evidence for the role of the gut-liver axis in linking serum carotenoids and NAFLD. It highlights the potential for dietary interventions and microbiota modulation as strategies for preventing NAFLD. Future research should aim to address the limitations of this study and further explore the mechanisms underlying the gut-liver axis in the context of NAFLD. I look forward to seeing more research in this exciting and important field (3).

Acknowledgments

None.

Footnote

Provenance and Peer Review: This article was a standard submission to the journal. The article did not undergo external peer review.

Funding: None.

Conflicts of Interest: The author has completed the ICMJE uniform disclosure form (available at https://hbsn.amegroups.com/article/view/10.21037/hbsn-2025-596/coif). The author has no conflicts of interest to declare.

Ethical Statement: The author is accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.

References

1. Yan Y, Zhang K, Li F, et al. The gut-liver axis links the associations between serum carotenoids and non-alcoholic fatty liver in a 7.8-year prospective study. Hepatobiliary Surg Nutr 2025;14:16-32. [Crossref] [PubMed]
2. Liu C, Sun X, Peng J, et al. Association between dietary vitamin A intake from different sources and non-alcoholic fatty liver disease among adults. Sci Rep 2024;14:1851. [Crossref] [PubMed]
3. Sharma S, Tiwari N, Tanwar SS. The current findings on the gut-liver axis and the molecular basis of NAFLD/NASH associated with gut microbiome dysbiosis. Naunyn Schmiedebergs Arch Pharmacol 2025;398:11541-79. [Crossref] [PubMed]