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Glucose Tracking
Continuous glucose monitoring provides real-time insights into blood sugar levels, helping individuals stabilize glucose for improved metabolic function and sustainable weight loss. By tracking glucose fluctuations, users can identify patterns that impact energy levels, make informed dietary choices, and maintain optimal blood sugar levels essential for overall metabolic health.
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What is Glucose Tracking?
Glucose tracking involves measuring blood sugar levels. Monitoring glucose helps one assess glucose spikes and drops in the blood, with the goal of maintaining stable glucose levels. It allows one to capture glucose movements dependent on food choices, exercise, or sleep habits. Beyond its use in clinical settings for diabetes, glucose monitoring can offer valuable insight into one’s metabolic function.
There are multiple ways to measure glucose:
- Individual capillary tests like fingerstick measurements, offering a single-point snapshot (post-meal)
- HbA1c test which reflects average blood glucose over ~3 months via glycated hemoglobin quantification
- Fasting plasma glucose (FPG) measures blood sugar after an 8–10 hour fast
- Continuous glucose monitoring (CGM) which is dynamic, 24-hour tracking utilizing a subcutaneous (under-skin) sensor that measures glucose in interstitial fluid
Normal Range for Blood Sugar
Normative glucose values are crucial in assessing, interpreting, and monitoring results. These references presented below are general, normal, or standard measures.
Normal Glucose Levels
Normal range for glucose is considered
- Fasting (8 hours): 70–99 mg/dL (3.9–5.5 mmol/L)
- Postprandial (2 hours after meals): <140 mg/dL (7.8 mmol/L)
- HbA1c: <5.7%
- CGM Daily Mean glucose: 70–140 mg/dL (3.9–7.8 mmol/L)
Elevated Glucose Levels (Hyperglycemia)
Increased range for glucose, or hyperglycemia (prediabetes) is considered
- Fasting (8 hours): ≥126 mg/dL (7.0 mmol/L)
- Postprandial (2 hours after meals): <180 mg/dL (<10.0 mmol/L)
- HbA1c: ≥6.5%
- CGM Daily Mean glucose: >180 mg/dL (10.0 mmol/L)
Optimal Glucose Levels (by Levels)
Optimal glucose levels, based on numerous studies and comprehensive analysis from the Levels team considers the goal to be (1)
- Fasting glucose in the lower range of 72-85 mg/dL
- Pre-meal (baseline) 72-90 mg/dL
- Post-meal glucose peak: <110 mg/dL
- Mean 24-hour glucose: 79-100 mg/dL
While glucose levels are specific to each individual, the comprehensive analysis at Levels shows a metabolically healthy and functional individual rarely goes above 140 mg/dL or below 60 mg/dL, staying in the range of 70-120 mg/dL for around 90% of the day. (1) (2) (3) (4)
The Importance of Stabilizing Blood Sugar Levels
The level of glucose in the blood is by far one of the most important metrics with strong correlation to longevity. As a metabolic marker, glucose strongly dictates metabolic function.
High glucose levels or chronic hyperglycemia lead to a range of metabolic issues like weight gain, inflammation, and diabetes associated with mortality. (5) (6) (7) (8) A diet high in refined carbohydrates is one common thread for metabolic dysfunction. (9) Excess glucose increases inflammation and oxidative stress, being detrimental to glucose transport, mitochondria, and metabolic function. (10) (11) (12)
Since high glucose leads to the development of metabolic syndrome, low energy, and weight gain, stabilizing blood glucose is essential. Precisely monitoring glucose levels is key, since humans can’t predict their blood glucose values.
Monitoring glucose is therefore the first step to understanding how our glucose fluctuates and taking real-time habits to the test, with the aim to achieve a stable, or functional glucose range.
What is glycemic variability, and how is it measured?
Glycemic variability (GV) refers to the fluctuations or changes in blood glucose levels throughout the day and between days. It encompasses both the magnitude and frequency of glucose excursions, including spikes after meals and drops during fasting or activity.
GV is typically measured using metrics such as standard deviation (SD) of glucose readings, mean amplitude of glycemic excursions (MAGE), and sometimes as a percentage of average glucose.
Continuous glucose monitoring (CGM) systems are the most effective tools for capturing these fluctuations, as they provide continuous data points throughout the day and night.
Why is glycemic variability important for health?
High glycemic variability has been associated with increased risk for both short-term and long-term health complications. Large swings in glucose can cause oxidative stress, which damages tissues and may contribute to the development of diabetes complications, cardiovascular disease, and metabolic dysfunction.
Research suggests that these fluctuations may be more harmful than sustained high glucose levels alone, making GV an important target for monitoring and management, especially in people with diabetes.
How do continuous glucose monitors (CGMs) work?
CGMs are wearable devices that continuously measure glucose levels in the interstitial fluid just beneath the skin, providing real-time data every few minutes. Unlike traditional blood glucose meters, which require fingerstick samples and only provide a snapshot at a single moment, CGMs track trends, patterns, and variability over time. CGMs consist of a sensor, a transmitter, and a receiver or smartphone app. They can alert users to high or low glucose events and help personalize diabetes management.
What are normal glucose levels and how often should glucose be monitored?
For most adults with diabetes, the recommended target for “time in range” is having glucose levels between 70 and 180 mg/dL for at least 70% of the day. However, the optimal range is likely a little lower, between 65 and 140 mg/dL for the majority (<80%) of the day.
The frequency of monitoring depends on the individual’s treatment plan, but CGMs provide continuous data, which is especially useful for those on insulin or with frequent glucose fluctuations. Traditional fingerstick testing frequency varies, but CGMs allow for more comprehensive tracking and better detection of patterns
What factors affect glycemic variability, and how can it be reduced?
Several factors influence glycemic variability, including:
- Diet (especially carbohydrate type and timin)
- Physical activity (intensity and frequency)
- Stress and illness
- Medication or GS-agent timing and dosing
- Sleep quality
To reduce GV, individuals should aim for balanced meals with low glycemic index carbohydrates, regular physical activity, stress management, and consistent medication routines. Monitoring glucose trends with a CGM can help identify triggers and allow for more precise adjustments to lifestyle and treatment
Glucose Tracking for Metabolic Function
Metabolic function is about converting food to energy efficiently. Metabolic dysfunction means a part of this chain isn’t working properly. In most cases, it’s the inability to utilize glucose to create energy from it, typically due to poor insulin sensitivity.
Numerous studies show that high blood glucose levels are associated with poor metabolic function. People in the higher range for fasting glucose (>85 mg/dL) have increased risk of diabetes and cardiovascular disease, compared to those with lower levels. (12) (13) (14) (15) (8)
Strategies to stabilize, or lower blood glucose levels include dietary approaches like calorie restriction, ketogenic diet, or intermittent fasting which all share a common thread, reduced total consumption of glucose. (16) (17) (18) This can improve the fat metabolism, or the body’s ability to burn fat for fuel.
Beyond these shifts, swapping simple (high-GI) for complex carbohydrates (low-GI) foods is recommended, and eating more fiber as well. Reducing processed, refined carbohydrates greatly contributes as well.
Tracking glucose during this process is key to understanding how the dietary changes have affected one’s glucose levels.
Glucose Tracking for Weight Loss
The only widely accepted equation for weight loss is eating fewer calories than burning, or calorie deficit. However, glucose fluctuations cause hormonal disruptions, mood swings, and energy deficits that trigger overeating. Such an imbalance, or a gap in energy increases the drive for eating, leading to weight gain.
Having stable blood glucose levels can significantly contribute to enhanced energy metabolism, keeping the levels of energy more stable.
One study showed 3.3 lb reduction over 33 days in 944 subjects using an AI app that personalizes feedback and tracks glucose responses. (19)
- 90% of CGM users feel it contributes to healthier lifestyle and good choices (20)
- 47% being more likely to go for a walk or do physical activity (20)
- 87% modifying food choices based on glucose fluctuations (20)
Tracking glucose is a versatile tool that can improve glucose stabilization, used in diabetic research. (21) (22) Since stabilizing glucose plays a major role in weight loss, including a CGM device can be of great assistance to weight management programs.
How to Track Blood Sugar Levels?
There are multiple methods for monitoring glucose levels. From individual set-point tests to dynamic tracking over 24-hour periods. CGM is superior to individual tests, due to its more comprehensive data points, trends, and pattern recognition which stem from consistency.
Continuous Glucose Monitoring (CGM)
CGM systems provide real-time, dynamic glucose readings by measuring interstitial fluid glucose levels via a subcutaneously inserted sensor. The sensor transmits data to a receiver or compatible device, allowing for continuous tracking of glucose trends and patterns.
Self-Monitoring of Blood Glucose (SMBG)
SMBG involves intermittent capillary blood sampling, typically via fingerstick, to obtain immediate glucose readings. While less comprehensive than CGM, SMBG remains a practical tool for day-to-day glucose management, especially in settings where CGM is unavailable or cost-prohibitive.
Glycated Hemoglobin (HbA1c)
HbA1c testing reflects the average blood glucose concentration over the preceding 2-3 months by measuring the percentage of hemoglobin molecules glycated with glucose. It serves as a standard indicator for long-term glycemic control and is instrumental in diagnosing and monitoring diabetes mellitus.
Fasting Plasma Glucose (FPG)
FPG assesses blood glucose levels after an overnight fast of at least eight hours. It is commonly used in diagnosing diabetes and evaluating basal glycemic control.
Continuous Glucose Monitor (CGM)
Continuous glucose monitor offers dynamic, 24-hour glucose measuring by tracking glucose points every 5-15 minutes. This provides great insight into how eating habits impact blood glucose levels.
CGM is the patch people put on their arm, that has a three-component design system:
1. Subcutaneous sensor
A disposable or implantable electrode coated with glucose oxidase detects interstitial glucose through an enzymatic reaction (glucose + O₂ → gluconic acid + H₂O₂), generating an electrical signal proportional to glucose concentration.
2. Transmitter
Wirelessly relays data to a receiver or smartphone, often using Bluetooth technology.
3. Software
Algorithms convert sensor signals into glucose values, accounting for lag (5–15 minutes) between interstitial fluid and blood glucose. Factory-calibrated systems eliminate fingerstick calibration, while others require periodic capillary blood validation.
The data can be shown via an app on your phone, representing glucose movements during the day. Some companies offer more comprehensive data analysis tools, to identify trends and patterns, while notifying the user of suboptimal spikes and drops in glucose.
