SiBio Continuous Ketone Sensor Detects Frequent, Benign Ketosis in Type 1 Diabetes on Low-Carb Diets
Background
Type 1 Diabetes (T1D) patients face a constant risk of diabetic ketoacidosis (DKA), a life-threatening complication characterized by high blood ketones and metabolic acidosis. While very-low carbohydrate (ketogenic) diets can improve glycemic control in T1D, concerns about DKA often limit their adoption. Current ketone monitoring relies on intermittent capillary measurements, which can miss transient elevations and don't provide real-time insight into ketone trends. Continuous ketone sensors offer a potential solution to differentiate benign nutritional ketosis from impending DKA, thereby enhancing safety and enabling broader use of beneficial low-carb strategies.
Study Design
Researchers evaluated the accuracy of a novel SiBio continuous ketone sensor and quantified physiological ketone metrics in 16 adult participants with Type 1 Diabetes on automated insulin delivery. Participants underwent two 6-day ketogenic diets (<50 g/day carbohydrates) in random order, one with intermittent 12-hour fasting. Between diets, a 6- to 8-hour insulin suspension experiment assessed sensor accuracy. Sensor readings were compared against capillary ketone levels measured by a FreeStyle Libre 2 meter, with primary endpoints being mean absolute difference (MAD) and relative MAD for various ketone thresholds.
Results
The study collected 870 paired sensor-meter data points from 16 participants. The SiBio sensor demonstrated preliminary accuracy, with a mean absolute difference (MAD) of 0.1 (0.1) mmol/L for ketone values <0.6 mmol/L. For higher ketone levels, the relative MADs were 24.2% (17.1) for values ≥0.6 mmol/L and 19.6% (13.3) for values ≥1.0 mmol/L. Over 155 days of ketogenic dieting, 81 ketosis events (ketone levels ≥0.6 mmol/L) lasting more than 15 minutes were recorded, averaging 3.7 events/week. The median duration of these events was 60 (30-105) minutes. Importantly, glucose levels, basal insulin delivery, and time of day were not correlated with these ketosis events.
All ketosis events except one were asymptomatic, suggesting that transient ketone elevations during very-low carbohydrate diets in Type 1 Diabetes are often benign.
Key Findings
- SiBio continuous ketone sensor showed a mean absolute difference of 0.1 mmol/L for ketone values <0.6 mmol/L.
- Relative MADs were 24.2% for ketones ≥0.6 mmol/L and 19.6% for ketones ≥1.0 mmol/L.
- Participants experienced 81 ketosis events (≥0.6 mmol/L) over 155 days, averaging 3.7 events/week.
- Median duration of ketosis events was 60 minutes (30-105 min).
- All but one ketosis event were asymptomatic, indicating benign transient ketosis is common.
Why It Matters
This study provides crucial evidence that Type 1 Diabetes patients on very-low carbohydrate diets frequently experience transient, benign ketosis, which is distinct from DKA. Continuous ketone monitoring could empower T1D patients to safely adopt low-carb dietary strategies by providing real-time data to differentiate nutritional ketosis from pathological DKA. This could lead to improved glycemic control and reduced fear of DKA, expanding therapeutic options. While the SiBio sensor shows promise, further validation in larger, longer studies is needed before widespread clinical adoption. However, these findings lay the groundwork for integrating continuous ketone monitoring into automated insulin delivery systems, potentially revolutionizing T1D management and dietary flexibility.
type-1-diabetes
ketosis
diabetic-ketoacidosis
continuous-ketone-monitoring
low-carbohydrate-diet
device-validation