Blood sugar, also called blood glucose, is an important source of energy for the body. Your body carefully regulates glucose levels with the help of insulin, a hormone produced by the pancreas. When blood sugar remains too high or drops too low, it can affect how you feel and, when persistent, may contribute to serious health complications.

Understanding your blood sugar levels is particularly important if you have diabetes, prediabetes, or risk factors for developing these conditions. Regular monitoring and appropriate medical care can help you maintain healthier glucose levels and protect your long-term health.

What Are Blood Sugar Levels?

Blood sugar levels refer to the amount of glucose circulating in your bloodstream at a particular time. Levels naturally change throughout the day depending on factors such as meals, physical activity, stress, illness and medications.

For most adults with diabetes, Diabetes Canada provides general blood glucose targets of 4.0 to 7.0 mmol/L before meals and 5.0 to 10.0 mmol/L two hours after eating. However, these targets are not appropriate for everyone. Your healthcare provider may recommend different targets based on your age, health, medications and individual circumstances.

Why Blood Sugar Control Matters

Consistently elevated blood sugar can gradually damage blood vessels and organs. Over time, poorly controlled diabetes can increase the risk of complications affecting the eyes, kidneys, nerves, heart and circulation. Keeping blood glucose within an appropriate range can help reduce these risks.

Low blood sugar can also be a concern, particularly for people taking insulin or certain diabetes medications. Symptoms may include shakiness, sweating, hunger, dizziness, confusion or weakness. Severe hypoglycemia can become an emergency and requires prompt treatment.

The goal is therefore not simply to have the lowest possible blood sugar. Instead, the goal is to maintain glucose within a safe, individualized range.

Understanding A1C

A blood glucose reading shows your level at a particular moment. An A1C test provides a longer-term picture by estimating your average blood sugar over approximately the previous two to three months. It is commonly used to help diagnose diabetes and prediabetes and to monitor diabetes management.

For many adults with diabetes, an A1C of 7.0% or less is a commonly recommended target, although individual goals may differ. Diabetes Canada emphasizes that blood sugar and A1C targets should be personalized according to the individual’s circumstances.

Your doctor may recommend periodic A1C testing to determine whether your current lifestyle and treatment plan are working effectively.

What Can Affect Blood Sugar?

Blood glucose can be influenced by many everyday factors, including:

• The type and amount of food you eat
• Physical activity
• Stress and emotional changes
• Illness or infection
• Sleep patterns
• Alcohol consumption
• Medications
• Insulin production and sensitivity

Tracking your blood sugar, meals, physical activity and medications can help you and your healthcare provider identify patterns and make informed adjustments when necessary.

Healthy Habits Can Make a Difference

If you are concerned about blood sugar, several healthy habits can support better glucose management. Eating balanced meals with appropriate portions, staying physically active, maintaining a healthy weight, getting adequate sleep and taking prescribed medications as directed can all be part of an effective diabetes management plan.

It is also important to attend regular medical appointments. Blood pressure, cholesterol, kidney health and other cardiovascular risk factors should be monitored because diabetes can increase the risk of heart and blood vessel problems.

When Should You Speak With a Doctor?

If you experience symptoms such as excessive thirst, frequent urination, unexplained weight loss, persistent fatigue or blurred vision, speak with a healthcare professional. These symptoms can occur with elevated blood sugar and should be properly assessed.

People who already have diabetes should also discuss consistently high or low readings with their healthcare provider rather than changing medication doses on their own.

At ÜNITY Medical Centre in Hamilton, ON, Dr. Ayman Srajeldin and the healthcare team can help patients understand their blood sugar results, assess diabetes risk factors and develop an appropriate approach to ongoing health management.

Healthy blood sugar management is about more than one number. It is about understanding your results, identifying risks early and working with your healthcare team to protect your health over time.

FAQs

What is a normal blood sugar level?

Blood sugar varies depending on whether you have eaten and whether you have diabetes. For many adults with diabetes, general targets are 4.0–7.0 mmol/L before meals and 5.0–10.0 mmol/L two hours after eating. Individual targets may differ.

What is an A1C test?

An A1C test measures the amount of glucose attached to haemoglobin and provides an estimate of average blood sugar levels over the previous two to three months.

How often should I check my blood sugar?

The frequency depends on your type of diabetes, treatment, medications and overall health. Your doctor or diabetes care team can recommend when and how often you should test.

Can stress affect blood sugar?

Yes. Stress can affect blood glucose levels, and illness or changes in routine can also make glucose more difficult to control. Tracking patterns can help identify how different factors affect your readings.

When is high blood sugar a concern?

Repeatedly elevated readings should be discussed with your healthcare provider. Very high blood sugar accompanied by significant symptoms such as vomiting, severe weakness, confusion or difficulty breathing requires urgent medical assessment.

Can lifestyle changes improve blood sugar?

Healthy eating, regular physical activity, maintaining a healthy weight, adequate sleep and taking prescribed medications correctly can support better blood sugar management. Your healthcare provider can help create an approach suited to your individual needs.