Understanding Your Results

Understanding Blood Glucose Ranges

Blood glucose testing provides information about how your body processes sugar. The ranges shown below are commonly referenced guidelines. Your healthcare provider can help you understand what your specific results mean for your individual health situation.

When and How to Test

Understanding when to test can help you gather meaningful information about how your body responds to food, activity, and other factors throughout the day.

Fasting Glucose Testing

Timing: After at least 8 hours without food or drink (except water), typically first thing in the morning.

What this measurement represents: Fasting glucose reflects your baseline blood sugar level when you haven't eaten recently. This is one of the most common ways to monitor glucose levels.²

Post-Meal Glucose Testing

Timing: 1-2 hours after the first bite of your meal.

What this measurement represents: Post-meal testing shows your body's glucose response to the foods you've eaten. People without diabetes typically stay below 140 mg/dL two hours after eating.³ Diabetes Canada guidelines suggest target ranges of 5.0-10.0 mmol/L (90-180 mg/dL) two hours after meals for people with diabetes.⁴

Understanding Ketone Levels

Ketones are an alternative fuel source your body produces when it shifts from primarily using glucose (from carbohydrates) to burning fat for energy. While glucose testing is widely known, ketone monitoring provides unique insight into your metabolic state and can be valuable for various health and performance goals.

What Are Ketones?

When your body breaks down fat for fuel - whether from dietary fat or stored body fat - your liver produces three types of ketone bodies: beta-hydroxybutyrate (BHB), acetoacetate, and acetone. Blood ketone meters measure BHB, which is the most abundant and stable ketone in your bloodstream.

Why Monitor Ketones?

Ketone monitoring can be valuable if you're:

• Following a ketogenic or low-carbohydrate diet and want to confirm you're in ketosis
• Practicing intermittent or extended fasting
• Interested in metabolic flexibility - your body's ability to efficiently switch between fuel sources
• An athlete exploring fat adaptation for endurance performance
• Managing certain health conditions under medical supervision
• Optimizing mental clarity and cognitive performance

Ketone Level Ranges

If you're following a ketogenic or low-carbohydrate diet, monitoring ketones can provide insight into whether your body is producing and using ketones for fuel.

Light Ketosis (0.5-1.5 mmol/L): Many people reach this range after several days of low-carb eating or after fasting for 12-16 hours. This level indicates your body is producing ketones and beginning to use fat for fuel. Many people feel good and experience benefits in this range.

Moderate Ketosis (1.5-3.0 mmol/L): Often seen in people who are consistently following a ketogenic diet or combining low-carb eating with intermittent fasting. This range is commonly associated with appetite suppression, mental clarity, and sustained energy.

Deep Ketosis (3.0+ mmol/L): Commonly observed during extended fasting periods or very strict carbohydrate restriction. While some people target this range, higher isn't necessarily better - many people achieve their goals in lower ranges.

Below 0.5 mmol/L: Your body is primarily using glucose rather than ketones for fuel. This is completely normal if you're not following a low-carb diet. If you're attempting to enter ketosis, it typically takes 3-7 days of carbohydrate restriction to begin producing measurable ketones.

What Affects Ketone Levels?

Your ketone levels can vary based on:

• Carbohydrate intake: The primary factor - lower carbs generally mean higher ketones
• Protein intake: Very high protein can reduce ketone production in some people
• Fat intake: Dietary fat provides the raw material for ketone production
• Time of day: Ketones often rise throughout the day and are typically lowest in the morning
• Exercise: Intense exercise may temporarily lower ketones, while moderate activity can increase them
• Fasting duration: Longer fasts typically produce higher ketone levels
• Individual metabolic factors: Everyone produces and uses ketones differently
• For women: Hormonal cycles can significantly impact ketone production and consumption - see women's health section below

Tracking Patterns Over Time

Single readings provide a snapshot, but tracking your results over days and weeks reveals patterns that can be more meaningful than any individual measurement.

Factors That Affect Your Results

Many factors beyond food can influence your glucose and ketone measurements:

• Sleep quality: Poor sleep can affect how your body manages blood sugar
• Physical activity: Exercise typically lowers glucose and may temporarily lower ketones
• Stress: Stress hormones can cause blood sugar to rise
• Illness: Being sick often raises glucose levels temporarily
• Medications: Some medications can affect glucose readings
• Hormonal changes: Monthly cycles, perimenopause, menopause, and pregnancy can affect glucose and ketone levels - learn more in the women's health section below

This is why one unexpected reading doesn't necessarily mean something is wrong. Looking at patterns over time gives you a more complete picture.

Using Your Test Results

Home testing provides data points that you can track over time and discuss with your healthcare provider. Here are some common reasons people test and what they often track:

Tracking Glucose Patterns

• Many people test at different times of day to observe their glucose patterns
• Testing before and after meals can reveal how individual foods affect glucose levels
• Some people note other factors in their tracking, such as sleep, stress, or physical activity
• Sharing your tracking records with your healthcare provider can help inform conversations about your health

Monitoring Ketone Levels

• People following low-carbohydrate diets often track ketone levels to see if their body is producing ketones
• Ketone production typically begins after several days of carbohydrate restriction
• Ketone levels can vary throughout the day and may be affected by diet, activity, and other factors
• Your healthcare provider can help you understand what your ketone measurements mean in the context of your individual health goals

Celebrating Progress

• When your results align with your tracking goals, take time to note what's been consistent in your routine
• Document the foods, sleep patterns, and activities associated with the measurements you're working toward
• This information can be valuable to review over time and share with your healthcare provider
• Positive trends can help inform your ongoing health conversations

Beyond Diabetes: Glucose and Ketones as Metabolic Health Markers

While glucose monitoring is essential for diabetes management, blood glucose and ketones are also key markers of metabolic health for anyone interested in optimizing their overall wellbeing.

What is Metabolic Health?

Metabolic health describes how well your body generates and processes energy from the food you eat. When your metabolism is functioning optimally, you may experience:

• Sustained energy throughout the day without crashes or brain fog
• Better mental clarity, focus, and cognitive performance
• More stable moods and reduced anxiety
• Improved physical performance and faster recovery from exercise
• Better sleep quality and consistent energy upon waking
• Easier weight management and body composition goals

Your Unique Metabolic Response

One of the most valuable insights from monitoring your glucose and ketones is discovering that your body responds differently than others to the same foods and activities. What causes a blood sugar spike in one person may have minimal impact on another.

By tracking your own results over time, you can identify the specific foods, meal timing, exercise routines, and lifestyle factors that work best for YOUR body. This personalized approach allows you to make informed decisions that support your individual metabolic health goals.

Metabolic Flexibility

Monitoring both glucose and ketones can provide insight into your metabolic flexibility - your body's ability to efficiently switch between using glucose and fat (ketones) for fuel. Greater metabolic flexibility is associated with improved energy stability, better athletic performance, and overall metabolic health.

For Women: Understanding Hormonal Impact on Glucose and Ketones

Hormonal fluctuations are a significant factor in both glucose and ketone readings for women, yet this is often overlooked. Understanding how your hormones affect these measurements can help you interpret your results with more context and reduce unnecessary concern about normal cyclical variations.

How Hormones Affect Glucose and Ketone Levels

Estrogen and progesterone - the primary female sex hormones - both influence how your body processes glucose, responds to insulin, and produces ketones. As these hormones rise and fall throughout your menstrual cycle, during pregnancy, perimenopause, and menopause, they can significantly impact your test results.

Research shows that insulin resistance increases during the luteal phase of the menstrual cycle, with measurements rising from an average of 1.35 in the mid-follicular phase to 1.59 in the early luteal phase.⁷ Studies using continuous glucose monitoring have found that women spend more time in healthy glucose ranges during the follicular phase (68.5% of the day) compared to the luteal phase (66.8% of the day).⁸

Many women notice patterns such as:

• Follicular phase (Days 1-14): Higher insulin sensitivity, better glucose metabolism, potentially lower ketone production even on low-carb diets
• Ovulation (Mid-cycle): Glucose and ketone fluctuations as estrogen peaks
• Luteal phase (Days 15-28): Increased insulin resistance, higher glucose readings, lower ketone levels due to increased consumption for energy
• Menstruation: Research shows glucose levels often rise while ketone levels may drop during this phase
• Perimenopause: More unpredictable glucose and ketone patterns as hormone levels become less stable
• Menopause: Changes in baseline glucose levels, insulin sensitivity, and metabolic flexibility
• Pregnancy: Significant changes in glucose metabolism and ketone production, particularly in the second and third trimesters

Understanding Ketone Variations During Your Cycle

If you're following a ketogenic or low-carbohydrate diet, you may notice your ketone levels are lower during certain phases of your cycle - particularly during menstruation and the luteal phase. This doesn't mean you're "doing keto wrong."

During the luteal phase, your body becomes more insulin resistant and has higher energy demands. Even while maintaining the same diet, your body may consume more ketones for energy, resulting in lower blood ketone measurements. This is a normal hormonal response, not a failure of your dietary approach.

Tracking Hormonal Patterns

If you're experiencing regular menstrual cycles, tracking your glucose readings alongside your cycle over several months can reveal your body's unique hormonal patterns. Note where you are in your cycle when testing, and look for recurring patterns.

For women in perimenopause or menopause, tracking can help identify how hormonal changes are affecting your metabolic health. Since perimenopause can last several years with fluctuating hormone levels, longer-term tracking becomes even more valuable.

This is Normal

Higher glucose readings during certain hormonal phases are a normal physiological response - not a sign that you're doing something wrong. These fluctuations reflect your body's hormonal rhythm, not failures in your diet or lifestyle.

Sharing your tracking data - including notes about your cycle or menopausal symptoms - with your healthcare provider can lead to more informed conversations about your hormonal health and any interventions that might be helpful.