The Glucose Ketone Index (GKI) compares blood glucose and ketone levels to estimate how deeply your body is running on fat vs sugar. Lower GKI values indicate deeper ketosis.
Formula: GKI = (Glucose (mg/dL) ÷ 18) × Ketones (mmol/L)
| GKI | Ketosis Level | Meaning |
|---|---|---|
| >9 | No Ketosis | Body running on sugar |
| 6–9 | Light Ketosis | Mild fat-burning |
| 3–6 | Nutritional Ketosis | Ideal for fat loss & metabolic health |
| 1–3 | Deep Ketosis | Strong fat-burning |
| <1 | Extreme Ketosis | Used in medical therapies |
How to lower GKI: cut carbs, fast longer, exercise, eat healthy fats. Aim for GKI <6 for fat loss, <3 for deeper ketosis.