Glucose Ketone Index May Offer a Broader Measure of Metabolic Health, Suggests Review
USA: A review published in Frontiers in Science suggests that the glucose ketone index (GKI)—a finger-prick measurement of the ratio between blood glucose and ketone levels—could help monitor metabolic health, particularly in people with cancer and chronic diseases. Researchers suggest that GKI may provide a more comprehensive picture of whole-body metabolic and endocrine function than blood glucose or body weight alone, potentially making it a useful biomarker for clinical monitoring.
The review, authored by Derek C. Lee from the Biology Department at Boston College, United States, and colleagues, highlights the growing burden of chronic noncommunicable diseases (NCDs), which now account for the majority of disability-adjusted life years worldwide. The authors note that cancer is among the leading causes of death and may soon surpass heart disease as the leading cause of mortality in the United States. They argue that improving metabolic health is central to preventing and managing many of these conditions.
The researchers noted that mitochondrial dysfunction, marked by impaired cellular energy production, is linked to several chronic conditions, including cancer, cardiovascular disease, type 2 diabetes, obesity, and neurodegenerative disorders. Poor diet, physical inactivity, and environmental toxins may contribute to this dysfunction.
The review states that the glucose ketone index (GKI), originally developed to monitor adherence to ketogenic therapy in cancer patients, is calculated using the ratio of blood glucose to the ketone body β-hydroxybutyrate (βHB). The authors suggest that GKI may provide a more comprehensive measure of metabolic health and chronic disease risk than blood glucose alone.
Key points from the review include:
- Mitochondrial dysfunction is associated with cancer, cardiovascular disease, type 2 diabetes, obesity, and neurodegenerative disorders.
- β-hydroxybutyrate is considered a highly efficient fuel for mitochondrial energy production, supporting ATP generation more effectively than glucose-derived pyruvate or fatty acids.
- The glucose ketone index measures the ratio of blood glucose to βHB and may help assess nutritional ketosis in outpatient settings.
- A lower GKI may reflect improved metabolic health by reducing inflammation, insulin resistance, hyperglycemia, and oxidative stress.
- Combining GKI monitoring with evidence-based nutrition and regular physical activity may help improve mitochondrial function and metabolic homeostasis, supporting the prevention and management of cancer and other chronic diseases.
The authors suggest that shifting the body's energy source from glucose to ketones may improve mitochondrial function while reducing inflammation, insulin resistance, and pathways that promote tumor growth.
They conclude that the glucose ketone index (GKI) could serve as a simple, individualized, and objective biomarker for monitoring metabolic health when used alongside evidence-based nutrition and exercise. However, they emphasize that further clinical studies are needed to validate its broader role in preventing and managing cancer and other chronic diseases.
Reference:
Lee, D. C., Duraj, T., Cooper, I. D., Maroon, J. C., Smith, K., Abdel-Hadi, W., Omene, E., Evangeliou, A. E., & Seyfried, T. N. (2026). The glucose ketone index: A proposed quantitative biomarker to support cancer and chronic disease prevention and management. Frontiers in Science, 4, 1763395. https://doi.org/10.3389/fsci.2026.1763395
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