The Complete Blood Sugar Levels Chart by Age (Fasting & After Eating)

23 Aug 2025

The Complete Blood Sugar Levels Chart by Age (Fasting & After Eating) Understanding blood sugar levels is crucial for maintaining overall health, ...

The Complete Blood Sugar Levels Chart by Age (Fasting & After Eating)

Understanding blood sugar levels is crucial for maintaining overall health, particularly in managing or preventing diabetes. These levels can fluctuate based on factors like age, diet, and physical activity. This comprehensive guide provides detailed blood sugar level charts for different age groups, covering both fasting and post-meal (after eating) readings.

Why Monitor Blood Sugar Levels?

Monitoring your blood sugar levels is essential for several reasons:

  • Early Detection of Diabetes: Regular monitoring can help identify prediabetes or diabetes early on, allowing for timely intervention.
  • Effective Diabetes Management: For those already diagnosed, tracking blood sugar helps adjust medication, diet, and exercise for optimal control.
  • Prevention of Complications: Maintaining stable blood sugar levels reduces the risk of long-term complications associated with diabetes, such as nerve damage, kidney disease, and heart problems.
  • Improved Overall Health: Understanding how your body responds to different foods and activities can lead to better health choices and a higher quality of life.

Understanding Blood Sugar Measurement Units

Blood sugar levels are typically measured in one of two units:

  • mg/dL (milligrams per deciliter): This unit is predominantly used in the United States.
  • mmol/L (millimoles per liter): This unit is more common in Canada, Europe, and other parts of the world.

You can easily convert between the two using the following formulas:

  • mg/dL = mmol/L x 18
  • mmol/L = mg/dL / 18

Fasting Blood Sugar Levels Chart by Age

Fasting blood sugar is measured after an overnight fast (usually at least 8 hours). These readings provide a baseline assessment of glucose control.

Age Group Normal Fasting Blood Sugar (mg/dL) Normal Fasting Blood Sugar (mmol/L) Prediabetes (mg/dL) Prediabetes (mmol/L) Diabetes (mg/dL) Diabetes (mmol/L)
Children (6-12 years) 70-130 3.9-7.2 N/A N/A >126 >7.0
Teens (13-19 years) 70-130 3.9-7.2 N/A N/A >126 >7.0
Adults (20+ years) <100 <5.6 100-125 5.6-6.9 ≥126 ≥7.0
Older Adults (65+ years) 80-140 4.4-7.8 N/A N/A >126 >7.0

Note: These values are general guidelines. Consult with a healthcare professional for personalized recommendations.

Blood Sugar Levels After Eating (Postprandial) by Age

Postprandial blood sugar refers to the blood sugar level measured 1-2 hours after eating. These readings help assess how well your body processes carbohydrates.

Age Group Normal After Eating (1-2 hours) (mg/dL) Normal After Eating (1-2 hours) (mmol/L) Diabetes (mg/dL) Diabetes (mmol/L)
Children (6-12 years) <180 <10.0 >180 >10.0
Teens (13-19 years) <180 <10.0 >180 >10.0
Adults (20+ years) <140 <7.8 >180 >10.0
Older Adults (65+ years) <180 <10.0 >180 >10.0

Note: These values are general guidelines. Individual targets may vary based on health status and treatment plans.

Factors Affecting Blood Sugar Levels

Numerous factors can influence blood sugar levels, including:

  • Diet: Carbohydrate intake has the most significant impact on blood sugar. The type and quantity of carbohydrates consumed affect blood sugar levels.
  • Physical Activity: Exercise helps lower blood sugar by increasing insulin sensitivity and using glucose for energy.
  • Stress: Stress hormones can raise blood sugar levels.
  • Illness: Infections and illnesses can cause blood sugar to fluctuate.
  • Medications: Certain medications, such as steroids, can increase blood sugar.
  • Age: As we age, insulin sensitivity may decrease, leading to higher blood sugar levels.
  • Hydration: Dehydration can affect blood sugar concentration, potentially leading to higher readings.

Tips for Maintaining Healthy Blood Sugar Levels

Adopting healthy lifestyle habits is key to maintaining stable blood sugar levels:

  • Balanced Diet: Focus on whole foods, including fruits, vegetables, lean proteins, and whole grains. Limit processed foods, sugary drinks, and high-fat foods.
  • Regular Exercise: Aim for at least 150 minutes of moderate-intensity exercise per week.
  • Consistent Meal Timing: Eat meals and snacks at regular intervals to prevent large fluctuations in blood sugar.
  • Portion Control: Be mindful of portion sizes to avoid overeating and excessive carbohydrate intake.
  • Stay Hydrated: Drink plenty of water throughout the day to maintain proper hydration.
  • Stress Management: Practice relaxation techniques like meditation, yoga, or deep breathing exercises to reduce stress levels.
  • Regular Monitoring: Monitor your blood sugar levels as recommended by your healthcare provider and keep a log of your readings.
  • Adequate Sleep: Aim for 7-8 hours of quality sleep per night, as poor sleep can negatively impact blood sugar control.

When to Seek Medical Attention

It’s important to consult a healthcare professional if you experience any of the following:

  • Consistently high blood sugar levels
  • Frequent episodes of low blood sugar (hypoglycemia)
  • Symptoms of diabetes, such as excessive thirst, frequent urination, unexplained weight loss, or blurred vision
  • Difficulty managing blood sugar levels despite lifestyle changes and medication

The Importance of Professional Guidance

Related reading: Why Did My Safe Food Suddenly Spike My Blood Sugar

Related reading: The Ultimate Guide To Controlling Blood Sugar Without Medication

Related reading: Fasting Blood Sugar Levels What S Normal High And In The Prediabetes Range

While this blood sugar level chart provides general guidelines, it is not a substitute for professional medical advice. Consulting with a healthcare provider is essential for personalized recommendations and a comprehensive diabetes management plan. They can help you determine your target blood sugar range, adjust medications as needed, and address any specific concerns or health conditions you may have. They can also recommend continuous glucose monitoring (CGM) or regular A1C tests to better manage your blood sugar over time.

Conclusion

Understanding and monitoring your blood sugar levels is crucial for maintaining good health and preventing or managing diabetes. By following the guidelines in this blood sugar levels chart, adopting healthy lifestyle habits, and consulting with a healthcare professional, you can take proactive steps to achieve optimal glucose control and improve your overall well-being. Remember that individual needs may vary, so always seek personalized advice from your doctor or a certified diabetes educator. Keeping your blood sugar within a healthy range can lead to a longer, healthier, and more fulfilling life.