Type 2 diabetes (T2D) is a chronic metabolic condition that, when properly managed, allows many individuals to live long and healthy lives. However, persistently elevated blood glucose levels can silently cause widespread damage throughout the body. Over time, uncontrolled hyperglycaemia (high blood glucose) harms blood vessels, nerves, and vital organs, increasing the risk of serious complications.¹ For this reason, managing blood glucose is essential for preventing life-threatening conditions, protecting organ function, and maintaining long-term health and quality of life.

When blood glucose levels remain high for long periods, they can damage the body in several important ways:

• Sugar attaches to tissues: Excess sugar attaches to proteins and fats in the body, forming harmful substances that gradually damage organs and blood vessels.²
  
• Cell damage increases (“oxidative stress”): High blood glucose creates unstable molecules that harm cells — similar to how rust slowly damages metal.²
  
• Ongoing internal inflammation: The body stays in a constant low-level inflammatory state, which quietly damages tissues over time.³
  
• Damage to blood vessels: High glucose harms the inner lining of blood vessels, making it harder for blood to flow properly and increasing the risk of heart disease, stroke, kidney disease, and other complications.⁴
  

Even if symptoms aren’t obvious at first, these processes can cause serious long-term health problems if blood glucose is not well managed. Here is an evidence-based list of why blood glucose management is critical in Type 2 diabetes.

Cardiovascular disease (CVD) is the leading cause of death in people with Type 2 diabetes.⁴

Elevated blood glucose contributes to atherosclerosis (plaque buildup in arteries) and increased arterial stiffness, which can lead to heart attacks, stroke, artery disease and kidney damage.⁵

Maintaining optimal blood glucose levels reduces vascular damage and lowers long-term cardiovascular risk.⁶

Diabetic nephropathy is one of the most serious complications of Type 2 diabetes and a leading cause of end-stage kidney disease in Australia.⁷ 1 in 4 people living with diabetes in Australia have chronic kidney disease.⁸

Persistent high blood glucose damages the glomeruli (filtering units of the kidneys), leading to:⁹

• Protein leakage in the urine (albuminuria)
• Progressive kidney dysfunction
• Dialysis or kidney transplant in advanced cases.
  

Tight blood glucose management has been shown to significantly delay the onset and progression of kidney disease.¹⁰

Diabetic neuropathy affects up to 50% of individuals with diabetes in Australia.⁹ High blood glucose damages nerves through:

•  Reduced blood supply
•  Oxidative stress
•  Metabolic injury.
  

Symptoms may include:¹¹

• Tingling or burning sensations
• Loss of sensation in the feet
• Hot or burning sensations, typically starting in the feet, legs, and hands.
       
  Effective glucose management reduces diabetic neuropathy risk and slows progression.¹²

Diabetic retinopathy is a leading cause of blindness among working-age adults in Australia.¹³

Hyperglycaemia damages retinal blood vessels, causing:

• Microaneurysms
  
• Haemorrhages
• Retinal swelling
  
• Vision loss.
  

Studies confirm that tighter blood glucose management significantly reduces the risk of retinopathy progression.¹⁴

Poor glucose management can lead to serious acute (sudden, immediate) emergencies, including:

• Hyperosmolar Hyperglycaemic State (HHS) - when blood glucose levels become extremely high and the patient requires hospitalisation
• Diabetic Ketoacidosis (DKA) - when blood glucose levels become extremely high and the patient requires hospitalisation.
• On the other hand, overly aggressive management without proper monitoring can result in hypoglycaemia (hypo), which may cause:15
• Weakness and shaking
• Confusion/Lack of concentration
• Numbness around lips and fingers
• Loss of consciousness.

Effective blood glucose management reduces the likelihood of highs and lows occurring and helps avoid acute emergencies.

Even before major complications develop, high variability in blood glucose can cause:¹⁵

• Fatigue
  
• Brain fog
  
• Mood changes
  
• Frequent urination
  
• Slow wound healing
  

Studies show that better glycaemic management is associated with improved cognitive function and overall well-being.¹⁶

Long-term studies indicate that sustained blood glucose management reduces diabetes-related complications and may extend life expectancy. The  UK Prospective Diabetes Study (UKPDS) follow-up study demonstrated a “legacy effect,” where early intensive glucose management provided long-term protection against complications and death.¹⁷ 

Effective management typically includes:¹⁸

• Balanced nutrition (low glycemic index foods, controlled carbohydrate intake)
  
• Regular physical activity
  
• Weight management
  
• Medication adherence (e.g., metformin, GLP-1 receptor agonists, SGLT2 inhibitors)
  
• Continuous glucose monitoring (CGM) when appropriate.

Blood glucose range requirements are influenced by a range of factors including age, overall health, pregnancy status and more. It’s best to speak with your GP, endocrinologist or diabetes educator to understand more about these ranges and the best approach to stay within them.

Diabetes-Specific Nutritional Formulas (DSNF), like Glucerna*, are formulated specifically for people with diabetes or impaired glucose tolerance, with a low GI slow-release carbohydrate blend aiding slower glucose absorption.

Glucerna* also contains myo-inositol, a carbohydrate naturally produced by the body and found in certain foods.¹⁹ Research has shown that it can mimic the role of insulin and supports glucose uptake from the blood.^19-21

Managing blood glucose in Type 2 diabetes is essential to prevent cardiovascular disease, kidney failure, nerve damage, vision loss, and premature mortality. Chronic hyperglycaemia silently damages blood vessels and organs, even when symptoms are not immediately noticeable.

Early intervention and sustained glycaemic management not only reduce complications but also improve daily quality of life and long-term independence. Effective blood glucose management is therefore the cornerstone of Type 2 diabetes care.