Endogenous ketosis lined up with fewer new atrial fibrillation cases in one ICU cohort, but the same biomarker pattern pointed the other way on general wards. Researchers at Qilu Hospital of Shandong University in Jinan, China, analyzed 23,892 hospitalized patients in MIMIC-IV v3.1 and found the setting mattered as much as the ketones. People with preexisting atrial fibrillation or flutter were excluded.
The team defined ketosis as urine ketones of at least 20 mg/dL or serum beta-hydroxybutyrate of at least 1.0 mmol/L. That distinction matters because beta-hydroxybutyrate is the primary ketone body in ketotic states, while urine ketone testing does not detect it. MIMIC-IV is a publicly available, deidentified Beth Israel Deaconess Medical Center database with more than 65,000 ICU patients and over 200,000 emergency department patients, giving the researchers a large real-world hospital sample.
In the ICU cohort of 10,251 patients, urine ketone positivity was independently linked to lower odds of incident atrial fibrillation, and propensity-matched analyses strengthened the signal for both urine ketones and beta-hydroxybutyrate. In the general ward cohort of 13,641 patients, urine ketone positivity was tied to higher atrial fibrillation incidence and increased adjusted odds. The study was submitted on May 18, 2026, revised on June 17, accepted on June 22, and published on June 25, 2026 in the Journal of Clinical Medicine.
That split fits the paper’s own framing that metabolic reprogramming in critical illness and the physiological stress of general hospitalization are fundamentally different states. Atrial fibrillation remains the most common sustained arrhythmia and a major driver of stroke, heart failure, dementia and hospitalization, and recent reviews describe metabolic remodeling that includes changes in glucose, lipid and ketone metabolism. A recent prospective UK Biobank study also linked circulating ketone bodies with incident atrial fibrillation in the general population.
The key read for keto diet followers is narrower than a headline might suggest: this was hospital ketosis, not everyday ketogenic dieting, and the same ketone signal carried very different meaning depending on whether the patient was in the ICU or on a general ward.
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