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Open research questions in Diet and metabolism studies

29 unresolved questions extracted from the limitations and future-work sections of 196 Diet and metabolism studies papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The intermittent energy restriction (iER) represents an effective dietary strategy for improving metabolic diseases including metabolic dysfunction-associated steatotic liver disease (MASLD) and type 2 diabetes mellitus (T2DM), yet the underlying mechanisms remain elusive.

    An intermittent energy restriction diet ameliorates comorbid MASLD and T2DM through the Klebsiella pneumoniae/LPS/Hepatic HADHA-K353 acetylation axis · 2026 · DOI

  • D-BHB-phenylalanine (D-BHB-Phe) is the most abundant BHB-amino acid and has been shown to reduce appetite and induce weight loss in mice, but its function and regulation in humans remain unclear.

    Ketosis elevates plasma concentrations of D-β-hydroxybutyryl-phenylalanine (BHB-Phe) in humans · 2026 · DOI

  • Conflict of interest Research on the effects of the ketogenic diet on metabolic syn- drome has significant limitations that make it difficult to unequivo- cally assess its effectiveness. They often include small groups of participants, which limits the ability to generalize the results to the entire population. In addition, many studies take a short time, making it difficult to assess the long-term effects and safety of such a diet. The results also vary due to differences in the composition of the ketogenic diet used in individual studies. Another important problem is the lack of standardization of methods for assessing metabolic parameters, which makes it difficult to compare results. Finally, some studies do not take into account factors such as physical activity or individual genetic predispositions, which can significantly affect the course of metabolic syndrome. The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

    The impact of the ketogenic diet on the health of patients with metabolic syndrome: a scoping review · 2026 · DOI

  • While KD has been shown to be effective in reducing seizure burden across different epilepsies, its antiseizure effect on infection-driven seizures, which are often driven by acute neuroinflammation, has not been evaluated.

    The Ketogenic Diet Fails to Mitigate Seizures and Neuroinflammatory Responses in a Mouse Model of Virus-Induced Epilepsy · 2026 · DOI

  • BackgroundThe ketogenic diet is being explored as an adjuvant intervention in breast cancer because it lowers circulating glucose and elevates ketone bodies such as {beta}-hydroxybutyrate (BHB), but how individual ER+ breast cancer subtypes adapt to these conditions remains poorly characterized.

    β-Hydroxybutyrate elicits divergent metabolic responses between MCF-7 and T47D ER+ breast cancer cells under glucose restriction · 2026 · DOI

  • Future studies should focus on bioactivity-guided fractionation, com- bined with in vitro cell experiments and in vivo animal models, to isolate and identify the key active constituents of DLT, and verify their specific regulatory effects and molecular targets on the gut microbiota, host metabolome and hepatic transcriptome.

    Synergistic modulation of the gut microbiome-liver-host metabolome axis associates with the therapeutic efficacy of Danlou tablet against metabolic syndrome · 2026 · DOI

  • The present body of evidence is limited by small cohort numbers, lack of blinding, and variability in diet composi- tion, treatment length, and levels of diet compliance. Most trials were conducted in an observational fashion, making it difficult to establish causality and rendering these trials vulnerable to selection bias. Moreover, the long-term fea- sibility of following very low carbohydrate diets is likely to remain a challenge for patients. The availability of only limited registered dietitians competent in ketogenic treat- ment and varying levels of patient compliance have been other challenges. Additionally, there is no common set of biomarkers for the following treatment response.

    Efficacy and safety of ketogenic diet in glioblastoma: an updated systematic review and meta-analysis · 2026 · DOI

  • Future studies ought to focus on large-scale multicenter ran- domized clinical trials incorporating standardized dietary approaches, metabolic profiling, and molecularly defined stratification. Molecularly defined stratification, accord- ing to patients' Isocitrate Dehydrogenase mutation and O6-Methylguanine-DNA Methyltransferase methylation status, would allow for identification of genetic predictors for metabolism-driven response [7, 8]. In addition, investi- gating combination therapies that combine a ketogenic diet with immunotherapy, antiangiogenic therapies, and inhibi- tors of glutamine metabolism may potentially maximize treatment responses. Data regarding neurocognitive and metabolic compliance and treatment response longitudi- nal data would also be crucial towards long-term feasibil- ity. The framework established by a study by Duraj et al. (2024), provides a sys.

    Efficacy and safety of ketogenic diet in glioblastoma: an updated systematic review and meta-analysis · 2026 · DOI

  • CR causes various metabolic changes in both the production and the circulation of metabolites1; however, it remains unclear which altered metabolites account for the physiological benefits of CR.

    Lithocholic acid phenocopies anti-ageing effects of calorie restriction · 2024 · DOI

  • There are four main limitations of this study. First, we show that BHB-Phe activates neural populations in the hypothalamus and brainstem. However, we do not further characterize the molecular identities of these neurons nor do we probe the functional consequences of their activation. In the future, such experiments would define which feeding-associated brain regions and cell types are important downstream effectors of the anorexigenic action of BHB-Phe. Second, our gain-of-function sufficiency studies with pharmacological administration of BHB-amino acids achieved supraphysiologic levels of metabolites in circulation. Although lower, more physiologically relevant concentrations were not tested here, such experiments may reveal more about the subtleties of how these ketone metabolites influence feeding and neural circuits in a physiological context. It is possible that lower, more physiologically relevant concentrations could selectively activate different subpopulations of neurons or produce more nuanced effects on feeding behavior or body weight. Such experiments might clarify the presence of potential dose-dependent ‘‘entourage effects,’’ where combinations of BHB-amino acids act synergistically at lower doses to modulate neural or metabolic reidentified CNDP2 point sponses. Third, we have not yet mutants that can only accept either BHB or lactate as substrates.

    A β-hydroxybutyrate shunt pathway generates anti-obesity ketone metabolites · 2024 · DOI

  • Future research should focus on highquality intervention trials to further quantify the potential of different lifestyle modifications, including consumption of a low-fat, WFPB diet to achieve remission of T2D…

    Type 2 Diabetes Remission and Lifestyle Medicine: A Position Statement From the American College of Lifestyle Medicine · 2020 · DOI

  • There are inherent limitations present in this review. The lifestyle intervention studies of T2D remission are few in number with wide variability of design as well as being generally limited to short-term outcomes. A majority of the therapeutic studies examined would not meet the definition of remission put forth by Buse et al,11 though there is a lack of consensus on duration needed to assess remission among clinicians and researchers.12 Most studies of remission have examined T2D of short duration, and success rates are higher the earlier treatment is initiated after diagnosis. This is not a systematic review; the list of studies (Tables 1-3) is not exhaustive but rather chosen to be representative of the position statement put forth.

    Type 2 Diabetes Remission and Lifestyle Medicine: A Position Statement From the American College of Lifestyle Medicine · 2020 · DOI

  • An emerging body of evidence demonstrates broad-spectrum health benefits attributed to being in nutritional ketosis, but no studies have specifically explored the use of a KD in a military population using daily ketone monitoring to personalize the diet prescription.

    Extended Ketogenic Diet and Physical Training Intervention in Military Personnel · 2019 · DOI

  • To treat the multi-factorial etiology of obesity, future research should explore drugs that act on the microbiome as well as multi-disciplinary strategies.

    Gut‐Brain Axis in Obesity: How Dietary Patterns Influence Psychological Well‐Being and Metabolic Health? · 2025 · DOI

  • While exercise is known to positively modulate myokines, contributing to their health-promoting effects, an exploration into how diet affects these critical cytokines remains sparse.

    The impact of dietary intervention on myokines: a narrative review · 2024 · DOI

  • The discussion section appears incomplete ('To the best of our knowled'), suggesting missing comparative analysis with existing literature on starvation ketoacidosis.

    Ketoacidosis due to Starvation · 2018 · DOI

  • No detailed methodology is provided for the diagnostic approach to differentiate starvation ketoacidosis from other causes of metabolic acidosis, representing a gap in standardized clinical protocols.

    Ketoacidosis due to Starvation · 2018 · DOI

  • The paper presents only a single case study of starvation ketoacidosis in an anorexia nervosa patient, limiting the generalizability of findings across different patient populations and starvation contexts.

    Ketoacidosis due to Starvation · 2018 · DOI

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29 open questions have been extracted from the limitations and future-work passages of 196 Diet and metabolism studies papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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