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Normal Blood Sugar Levels: The Ultimate Chart for Adults & Children

04 Sep 2025 by Sydney A. Westphal, M.D.

Normal Blood Sugar Levels: The Ultimate Chart for Adults & Children

Understanding and maintaining normal blood sugar levels is crucial for overall health, whether you have diabetes or not. This comprehensive guide breaks down the key numbers to know for adults and children, offering insights and actionable advice to help you stay on track.

Understanding Normal Blood Sugar Ranges for Adults

For adults without diabetes, here's a breakdown of typical blood sugar ranges:

  • Fasting Blood Sugar: This is measured after not eating for at least 8 hours. A normal fasting blood sugar level is generally between 70 and 100 mg/dL (3.9 to 5.6 mmol/L).
  • 2 Hours After Eating: Blood sugar levels should peak around 140 mg/dL (7.8 mmol/L) or less two hours after starting a meal.
  • A1C: This test provides an average of your blood sugar levels over the past 2-3 months. For individuals without diabetes, an A1C below 5.7% is considered normal.

For adults with diabetes, target ranges are often different and should be determined in consultation with a healthcare provider. These might include: What Is Postprandial Blood Sugar And What Should It Be 2 Hours After Eating

  • Fasting: 80-130 mg/dL (4.4 - 7.2 mmol/L)
  • 2 Hours After Eating: Less than 180 mg/dL (10.0 mmol/L)
  • A1C: Individualized goals, often below 7%

Blood Sugar Levels for Children

Maintaining healthy blood sugar levels is essential for children's growth and development. Here’s a breakdown:

  • Fasting (Age 2-5): 70-100 mg/dL (3.9 - 5.6 mmol/L)
  • Fasting (Age 6-12): 70-100 mg/dL (3.9 - 5.6 mmol/L)
  • Fasting (Age 13+): 70-100 mg/dL (3.9 - 5.6 mmol/L)
  • 1 Hour After Meal: Less than 140 mg/dL (7.8 mmol/L)
  • 2 Hours After Meal: Less than 120 mg/dL (6.7 mmol/L)
  • A1C: Generally, below 5.7% for children without diabetes.

Important Note: Blood sugar targets for children with diabetes are individualized and should be set by a healthcare professional. The Ultimate Guide To Your A1C Chart Levels And What It Means For You

Factors Affecting Blood Sugar Levels

Numerous factors can influence blood sugar readings, including:

  • Diet: The types and amounts of carbohydrates consumed significantly impact blood sugar.
  • Exercise: Physical activity helps improve insulin sensitivity and lowers blood sugar.
  • Stress: Stress hormones can raise blood sugar levels.
  • Illness: Being sick can cause blood sugar to fluctuate.
  • Medications: Certain medications can affect blood sugar.
  • Sleep: Lack of sleep can negatively impact blood sugar regulation.
  • Dehydration: Being dehydrated can concentrate blood sugar.

How to Monitor Your Blood Sugar

Regular monitoring is key to maintaining stable blood sugar levels. Methods include:

  • Fingerstick Glucose Meters: These portable devices provide quick readings.
  • Continuous Glucose Monitors (CGMs): These devices track blood sugar levels continuously and provide trend data.

Understanding Abnormal Blood Sugar Readings

  • Hyperglycemia (High Blood Sugar): Can lead to long-term complications like nerve damage, kidney disease, and vision problems.
  • Hypoglycemia (Low Blood Sugar): Can cause dizziness, confusion, and seizures.

Diet and Blood Sugar: A Comprehensive Guide

  • Focus on Whole Foods: Prioritize fruits, vegetables, lean proteins, and whole grains.
  • Control Carbohydrate Intake: Be mindful of portion sizes and choose complex carbohydrates over simple sugars.
  • Fiber is Your Friend: Fiber slows down sugar absorption.
  • Hydrate: Drink plenty of water.

Exercise Impacts Your Blood Sugar Level

  • Increases Insulin Sensitivity: Helps your body use insulin more effectively.
  • Lowers Blood Sugar: Physical activity helps your body absorb glucose for energy.
  • Variety is Key: Different types of exercise can impact blood sugar differently.

Disclaimer: This information is for general knowledge and informational purposes only, and does not constitute medical advice. It is essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment. The Oral Glucose Tolerance Test Ogtt Preparation And What To Expect

References and Further Reading