Ketogenic Diet for Intensive Care Patients: A Scoping Review

Background: Critical illness leads to profound metabolic, neuroendocrine and immune disorders that affect the prognosis of patients treated in intensive care units (ICUs). The ketogenic diet, a high-fat and low-carbohydrate eating model, is gaining increasing importance as a potential metabolic intervention in the ICU. Preliminary data suggest that the ketogenic diet (KD) may support the control of seizures in a super-refractive epileptic state (SRSE), stabilize glycemia, reduce insulin demand, and modulate the immune response in sepsis. The aim of this review was to present a synthetic presentation of the current state of knowledge regarding use of the KD in intensive care patients. Methods: The review was carried out in accordance with the guidelines of the Joanna Briggs Institute and PRISMA-ScR. PubMed, Scopus, EBSCO, Web of Science, Google Scholar and Cochrane Library databases were searched (10–19 April 2026) using the Population–Concept–Context model. Full-text observational studies, randomized trials and reviews of the use of KDs in ICU patients were included. Data extraction was performed independently by two reviewers. Results: Of the 42 publications identified, seven studies were included in the analysis. The KD was feasible and safe in both critically ill adults and children. In SRSE, most patients achieved stable ketosis within a few days, which often allowed for reduction or discontinuation of anesthetics. In sepsis, the KD led to glycemic stabilization, reduced insulin demand and reduced immune deregulation; in one study, “after day 4, none of the patients in the KD group required insulin treatment.” The KD also showed beneficial effects on cellular bioenergetics and mitochondrial function. The safety profile was acceptable and adverse reactions were manageable with appropriate monitoring. Conclusions: The KD represents a promising, non-pharmacological metabolic intervention in intensive care, particularly in the treatment of SRSE and in the stabilization of glucose metabolism in sepsis and other critical conditions. Despite the growing number of positive clinical observations, the available evidence remains limited due to small samples, heterogeneous protocols, and a lack of randomized trials. Further, well-designed prospective studies are needed to determine optimal KD implementation protocols and identify the patient populations that benefit most.