Ketogenic Diet and Neurological Health: Findings from a BERTopic‑Assisted Narrative Review
Research Analysis
The authors performed a narrative review of recent ketogenic‑diet literature (2021‑2025) and applied BERTopic to generate seven thematic clusters. The mapping highlighted a growing emphasis on the gut‑brain axis after 2023, while confirming established topics such as epilepsy, mitochondrial mechanisms, and Alzheimer’s disease. The review underscores heterogeneity in diet protocols and limited long‑term safety data.
Study and findings
The paper is a narrative review that incorporated a BERTopic‑based thematic analysis of the ketogenic‑diet literature indexed in Scopus, Web of Science and PubMed. After a structured search, the authors built a corpus of recent publications (2021‑2025) and applied BERTopic, using PubMedBERT embeddings and resampling to obtain a stable seven‑topic solution (stability >0.85). The resulting topics grouped studies around epilepsy and energy metabolism, mitochondrial function and inflammation, Alzheimer’s disease, the gut‑brain axis, broader neurodegenerative themes, migraine, and a heterogeneous cluster covering brain injury and biomarkers. Temporal mapping showed an increase in gut‑brain‑axis papers after 2023, while other topics remained relatively stable. The authors used the topics only as an organizational scaffold; they did not claim that the clusters represent independent mechanistic or clinical evidence.
Clinical interpretation
The thematic overview confirms that most recent ketogenic‑diet research continues to focus on seizure control and metabolic neuroprotection, with emerging interest in microbiome‑mediated pathways. However, the review highlights persistent gaps: protocols vary widely in fat‑to‑non‑fat ratios, carbohydrate limits, and use of medium‑chain triglycerides, making direct comparison of outcomes difficult. Long‑term efficacy and safety data, especially for neurodegenerative disorders, remain limited, and adherence challenges are frequently reported. The identified rise in gut‑brain‑axis studies suggests that investigators are exploring how diet‑induced changes in the microbiome might modulate neuroinflammation, but the clinical relevance of these pre‑clinical findings is still uncertain.
Limitations and open questions
The authors acknowledge that BERTopic does not eliminate subjectivity; topic boundaries depend on model choice, clustering parameters, and expert labeling. The corpus excludes grey literature, non‑English sources, and may be affected by publication bias toward positive findings. Because the review is narrative, it does not assess study quality, risk of bias, or provide quantitative synthesis. Consequently, the thematic maps should be viewed as descriptive representations of the published record rather than evidence of causal mechanisms. Open questions include: how do different ketogenic‑diet variants compare in long‑term neurological outcomes? Which patient phenotypes predict response? And what is the true clinical impact of gut‑brain‑axis modulation in humans?
Source
Jin B, Chen Z, Xie R, Liu Y. Ketogenic Diet and Neurological Health: A Narrative Review with Natural Language Processing‑Assisted Thematic Mapping Using BERTopic. Neuropsychiatr Dis Treat. 2026;10:627639.