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Blood glucose monitoring
Introducing Metabo-RAY
Monitoring blood glucose for metabolic health
Blood glucose monitoring has gone mainstream. Once primarily used for diabetes management, it is now being adopted by athletes, wellness enthusiasts, clinicians, and researchers seeking deeper insight into metabolic health.
Blood glucose tracking plays an important role in understanding and managing metabolic health, particularly given the strong links between glucose regulation and chronic disease risk, including diabetes.
| 589M adults globally have diabetes (≈1 in 9), projected to reach 850M by 2050. i | U.S.: 40M+ with diabetes; 100M+ with prediabetes—many undiagnosed. ii | Wearables are driving non-invasive health monitoring, with the U.S. market expected to reach $41B by 2033. iii |
As smartwatches and rings evolve beyond fitness tracking into platforms for physiological monitoring, they are opening the door to more accessible, everyday approaches to understanding metabolism.
What is blood glucose monitoring — and why does it matter?
Blood glucose monitoring measures the amount of sugar circulating in the bloodstream. Because glucose is the body’s primary fuel source, its regulation reflects how efficiently the metabolic system is functioning.
When we eat, glucose rises. Insulin is released. Cells absorb energy. In a metabolically healthy system, this process is smooth and controlled.
However, modern lifestyle factors — processed foods, chronic stress, sleep disruption, and inactivity — can strain this system. Over time, repeated glucose spikes and crashes may contribute to insulin resistance, fatigue, weight gain, and increased risk of chronic disease.
Monitoring glucose makes these patterns visible. It provides a window into metabolic function that was once largely invisible outside of clinical settings.
How do people monitor blood glucose today?
Several tools are commonly used:
- Fingerstick testing (SMBG): Provides single time-point measurements. Reliable and accessible, but limited to snapshots.
- Continuous glucose monitoring (CGM): Offers real-time trend data, revealing how meals, activity, and stress influence glucose throughout the day. Because CGMs measure glucose in interstitial fluid rather than directly in blood, there is typically a short time lag compared to blood glucose levels.
- Laboratory testing (HbA1c, fasting glucose, OGTT): Provides standardized clinical metrics and long-term averages, typically measured periodically.
Each method delivers valuable information. Together, they have transformed metabolic awareness.
However, most current approaches still require invasive or minimally invasive measurements, which can limit adoption—particularly for broader wellness applications.
What can blood glucose data actually tell you?
Glucose monitoring can help identify:
- How your body responds to specific foods
- Patterns of variability across the day
- Effects of stress, sleep, and exercise
- Overall glucose stability
For many individuals, especially those using CGMs, the personalization is powerful. Two people can eat the same meal and experience very different glucose responses.
But glucose primarily tells us what happened — not necessarily why it happened.
Is glucose enough? Enter: Metabo-RAY
Metabo-RAY: Estimating blood glucose using optical wearable signals
One emerging approach we are exploring is Metabo-RAY—a non-invasive health method under development powered by a patented algorithm, designed to estimate metabolic activity using signals already captured by wearable devices.
Rather than measuring glucose directly, Metabo-Ray analyzes subtle patterns in photoplethysmography (PPG) signals—commonly used in wearable devices for SpO₂ monitoring—to infer metabolic dynamics.
Because it builds on sensors already embedded in devices like smartwatches and rings, Metabo-RAY has the potential to enable continuous metabolic monitoring for everyday wellness —without the need for invasive sensors or additional hardware.
In this way, it points toward a future where metabolic insights are seamlessly integrated into wearables, making proactive health and wellness tracking more accessible to a broader population.
While still in development, Metabo-RAY reflects a broader shift toward more accessible, integrated, painless, and continuous monitoring of metabolic health.
Contributed by: Keita Makita
i International Diabetes Federation
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