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The Ultimate Blood Sugar Chart: A Guide to Normal Blood Sugar Levels
18 Sep 2025 By Karen Grothe, Ph.D., L.P.

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The Ultimate Blood Sugar Chart: A Guide to Normal Blood Sugar Levels

Understanding your blood sugar levels is crucial for maintaining optimal health and preventing or managing conditions like diabetes. This comprehensive guide breaks down what's considered normal, what different levels mean, and what you can do to keep your blood glucose within a healthy range. Understanding The Glycemic Index Gi For Effective Diabetes Management

Why is Blood Sugar Important?

Your blood sugar, or blood glucose, is the main sugar found in your blood and comes from the food you eat. It's your body's primary source of energy. Insulin, a hormone made by the pancreas, helps glucose from food get into your cells to be used for energy. When you have diabetes, your body either doesn't make enough insulin or can't use insulin as well as it should. This causes glucose to build up in your blood, which can lead to various health problems. Monitoring your blood sugar levels helps manage these problems.

Understanding Blood Sugar Readings

Blood sugar levels are typically measured in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L). It’s vital to understand what these numbers signify at different times of the day and under various circumstances. The following sections outline ideal ranges for individuals with and without diabetes.

Normal Blood Sugar Levels for People Without Diabetes

These ranges are generally accepted guidelines. Your doctor may have specific recommendations for you.

  • Fasting Blood Sugar (upon waking): 70-99 mg/dL (3.9-5.5 mmol/L)
  • Two Hours After Eating: Less than 140 mg/dL (7.8 mmol/L)

Blood Sugar Levels for People with Diabetes

Management goals can vary from person to person, but the following are generally accepted targets:

  • Fasting Blood Sugar (upon waking): 80-130 mg/dL (4.4-7.2 mmol/L)
  • Two Hours After Eating: Less than 180 mg/dL (10.0 mmol/L)
    • Note: A1c target generally below 7.0%

Blood Sugar Chart: A Detailed Breakdown (HTML Table)

This blood sugar chart provides a quick reference guide to understanding different blood sugar levels and their implications. Diabetes Management For A Healthier Life Where To Start

Category Fasting Blood Sugar (mg/dL) Fasting Blood Sugar (mmol/L) Two Hours After Eating (mg/dL) Two Hours After Eating (mmol/L) Implication
Normal (No Diabetes) 70-99 3.9-5.5 < 140 < 7.8 Healthy **blood sugar levels**
Prediabetes 100-125 5.6-6.9 140-199 7.8-11.0 Increased risk of developing type 2 diabetes. Lifestyle changes can help.
Diabetes 126 or higher 7.0 or higher 200 or higher 11.1 or higher Requires management with diet, exercise, medication, and regular monitoring.
Hypoglycemia (Low Blood Sugar) Less than 70 Less than 3.9 N/A N/A Requires immediate treatment (glucose tablets, juice, etc.).

Factors Affecting Blood Sugar Levels

Many factors can influence your blood sugar levels, including:

  • Diet: The type and amount of carbohydrates you consume have a direct impact.
  • Physical Activity: Exercise helps lower blood sugar.
  • Medications: Some medications can raise or lower blood sugar.
  • Stress: Stress hormones can elevate blood sugar.
  • Illness: Sickness can disrupt blood sugar control.
  • Dehydration: Lack of water can impact blood glucose levels.
  • Menstrual Cycle: Hormonal fluctuations can affect blood sugar.

How to Monitor Your Blood Sugar

There are several ways to monitor your blood sugar:

  • Home Blood Glucose Meter: A small device that measures your blood sugar using a drop of blood. This is the most common method.
  • Continuous Glucose Monitor (CGM): A device that tracks your blood glucose levels continuously throughout the day and night via a small sensor inserted under your skin. CGMs provide real-time data and trends, allowing for better management of blood sugar.
  • A1C Test: Measures your average blood sugar level over the past 2-3 months. This test is usually performed in a doctor’s office.

Tips for Maintaining Healthy Blood Sugar Levels

Here are some practical tips to help you maintain healthy blood sugar levels:

  • Eat a Balanced Diet: Focus on whole foods, including plenty of fruits, vegetables, and lean protein. Limit processed foods, sugary drinks, and refined carbohydrates.
  • Engage in Regular Physical Activity: Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
  • Monitor Your Blood Sugar Regularly: If you have diabetes, check your blood glucose levels as directed by your doctor.
  • Stay Hydrated: Drink plenty of water throughout the day.
  • Manage Stress: Practice stress-reducing techniques such as meditation, yoga, or deep breathing exercises.
  • Get Enough Sleep: Aim for 7-8 hours of quality sleep per night.
  • Work with Your Healthcare Team: Develop a personalized management plan with your doctor, diabetes educator, and registered dietitian.

What to Do If Your Blood Sugar is Too High (Hyperglycemia)

If your blood sugar is consistently high, talk to your doctor about adjusting your medication, diet, or exercise plan. Symptoms of hyperglycemia include increased thirst, frequent urination, blurred vision, and fatigue. Uncontrolled hyperglycemia can lead to serious complications.

What to Do If Your Blood Sugar is Too Low (Hypoglycemia)

If your blood sugar drops too low, you may experience symptoms such as shakiness, sweating, dizziness, confusion, and hunger. Treat low blood sugar immediately by consuming a fast-acting carbohydrate source, such as glucose tablets, fruit juice, or regular soda. Check your blood sugar again after 15 minutes to ensure it has returned to a safe level. If symptoms persist, seek medical attention. A Dietitian S Guide To Snacks That Won T Raise Your Blood Sugar

Conclusion

Understanding and managing your blood sugar levels is essential for overall health and well-being. Use this guide as a reference, and always consult with your healthcare provider for personalized advice and management strategies. Regularly monitoring your blood glucose and making informed lifestyle choices can empower you to live a healthier and more fulfilling life. ```

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