Understanding Diabetes Mellitus: A Guide for Our Patients
Understanding Diabetes Mellitus
A Guide for Our Patients
Diabetes Mellitus is one of the most common chronic diseases worldwide. Early diagnosis, healthy lifestyle habits, regular monitoring, and appropriate treatment can help prevent serious complications and improve quality of life.
What Is Diabetes Mellitus?
Diabetes mellitus is a chronic metabolic disorder in which your body is unable to properly process food for energy.
When we eat, carbohydrates are broken down into glucose, which enters the bloodstream. The pancreas produces a hormone called insulin, which acts like a key, allowing glucose to enter the body's cells to be used as energy.
In diabetes, this system no longer functions normally. Either:
- The pancreas does not produce enough insulin.
- The body's cells become resistant to insulin.
- Or both occur together.
As a result, glucose remains in the bloodstream instead of entering the cells, causing hyperglycaemia (high blood sugar).
Why Is Diabetes Dangerous?
Persistently high blood sugar can gradually damage many organs throughout the body, including:
- Heart
- Blood vessels
- Kidneys
- Eyes
- Nerves
- Brain
Diabetes is one of the leading causes of blindness, kidney failure, stroke, heart attack, and lower-limb amputation.
How Is Diabetes Diagnosed?
Doctors diagnose diabetes using blood tests. In most situations, a diagnosis requires two abnormal test results unless classic symptoms of diabetes are already present.
| Test | Diabetes Diagnostic Level |
|---|---|
| Fasting Plasma Glucose (FPG) | ≥ 7.0 mmol/L after 8–12 hours fasting |
| Oral Glucose Tolerance Test (OGTT) | 2-hour glucose ≥11.1 mmol/L |
| HbA1c (Glycated Haemoglobin) | ≥6.5% |
| Random Plasma Glucose | ≥11.1 mmol/L with symptoms |
Prediabetes
Prediabetes is diagnosed when blood sugar levels are above normal but have not yet reached the diabetes threshold. It serves as an important warning sign that Type 2 Diabetes may develop in the future if no intervention is taken.
Understanding Blood Sugar
Your body needs glucose for energy, but maintaining a healthy balance is essential.
Normal Blood Sugar
Insulin allows glucose to enter the body's cells where it is used efficiently for energy.
High Blood Sugar
Without enough insulin or when insulin resistance develops, glucose stays in the bloodstream and gradually damages organs.
Types of Diabetes
Diabetes is not a single disease. It is classified into several different types, each with its own causes and treatment approaches.
Type 1 Diabetes
An autoimmune disease in which the body's immune system attacks and destroys the insulin-producing beta cells in the pancreas.
Common Onset
- Children
- Teenagers
- Young adults
- Can occur at any age
Treatment
- Lifelong insulin injections
- Insulin pump therapy
- Cannot currently be prevented
Type 2 Diabetes
The most common type of diabetes, accounting for over 90% of all diabetes cases.
- Insulin resistance
- Progressive insulin deficiency
- Usually develops gradually
- Increasingly affecting younger adults
Treatment
- Healthy lifestyle
- Oral medications
- Injectable medications
- Insulin if required
Prediabetes
Blood sugar levels are higher than normal but not yet high enough to be diagnosed as diabetes.
Lifestyle intervention during this stage may delay or even prevent Type 2 Diabetes.
Gestational Diabetes
Diabetes first diagnosed during pregnancy.
- Usually develops during the second or third trimester.
- Often resolves after delivery.
- Increases future risk of Type 2 Diabetes.
Causes & Risk Factors
Type 1 Diabetes
The exact cause remains unknown, but research suggests a combination of:
- Genetic predisposition
- Family history of autoimmune disease
- Environmental triggers
- Certain viral infections
Type 2 Diabetes
- Overweight or obesity
- Central abdominal obesity
- Physical inactivity
- High sugar intake
- Processed foods
- Family history
- Age over 45
- Previous gestational diabetes
- PCOS
Lifestyle Modifications
Healthy lifestyle habits remain the cornerstone of preventing and managing Type 2 Diabetes while supporting better glucose control for people living with Type 1 Diabetes.
Balanced Diabetes-Friendly Diet
- Choose whole grains instead of refined carbohydrates.
- Increase vegetables and dietary fibre.
- Eat lean protein.
- Choose healthy fats.
- Reduce sugary drinks and processed foods.
- Spread carbohydrate intake evenly throughout the day.
Achieve A Healthy Weight
Losing only 5–10% of body weight can significantly improve insulin sensitivity and blood sugar control.
Even modest weight loss may reduce the risk of progressing from prediabetes to diabetes by more than 50%.
Regular Physical Activity
- At least 150 minutes of moderate aerobic exercise weekly.
- Walking
- Swimming
- Cycling
- Resistance training 2–3 times weekly.
- Avoid prolonged sitting.
Avoid Smoking & Limit Alcohol
Smoking increases cardiovascular risk and worsens insulin resistance.
Alcohol can unexpectedly increase or lower blood glucose, therefore moderation is recommended.
Stress Management & Sleep
- Practice relaxation techniques.
- Deep breathing.
- Mindfulness.
- Yoga.
- Sleep 7–9 hours every night.
- Treat sleep apnoea if present.
Medical Treatment
While lifestyle modification remains the foundation of diabetes management, many patients will also require medication to achieve safe and stable blood glucose levels.
Treatment Target
HbA1c < 7.0%
For most non-pregnant adults, the recommended HbA1c target is below 7.0%. However, treatment goals should always be individualised according to age, duration of diabetes, overall health, and other medical conditions.
Type 1 Diabetes Treatment
Patients with Type 1 Diabetes require lifelong insulin replacement therapy.
- Rapid-acting insulin (meal coverage)
- Long-acting insulin (basal insulin)
- Mixed insulin formulations
- Insulin pump therapy
Type 2 Diabetes – First-Line Medication
Metformin
Metformin is the recommended first-line medication for most patients with Type 2 Diabetes.
- Reduces glucose production by the liver
- Improves insulin sensitivity
- Safe and well established
- Cost-effective
Additional Diabetes Medications
SGLT2 Inhibitors
Examples:
- Dapagliflozin
- Empagliflozin
Benefits:
- Protect kidneys
- Protect heart
- Support weight loss
GLP-1 Receptor Agonists
- Semaglutide
- Liraglutide
Benefits:
- Improve insulin secretion
- Reduce appetite
- Significant weight loss
DPP-4 Inhibitors
- Sitagliptin
Provide mild glucose-lowering with a low risk of hypoglycaemia.
Sulfonylureas
- Gliclazide
Stimulate the pancreas to produce more insulin.
Insulin Therapy
Patients with Type 2 Diabetes may eventually require insulin if oral medications are no longer sufficient to achieve blood glucose targets.
Blood Glucose Monitoring
Regular blood glucose monitoring helps patients understand how food, exercise, illness, stress, and medication affect daily glucose levels.
- Self-monitoring using a glucometer
- Continuous Glucose Monitoring (CGM)
- Prevent hypoglycaemia
- Improve long-term glucose control
- Support treatment adjustments
Key Takeaway
Diabetes Mellitus is a lifelong condition, but it is highly manageable with the right care.
- ✔ Eat a healthy balanced diet
- ✔ Maintain a healthy weight
- ✔ Exercise regularly
- ✔ Monitor blood glucose
- ✔ Take medications as prescribed
- ✔ Attend regular medical check-ups
- ✔ Screen for eye, kidney, nerve and heart complications
Remember: Diabetes is a condition to be managed—not a sentence to be feared. Working together with your healthcare team can help you live a long, healthy and active life.
Disclaimer
This article is intended for health education purposes only and should not replace professional medical advice, diagnosis, or treatment. Always consult your doctor or healthcare provider regarding your personal medical condition, medications, and treatment plan.
Jul 09,2026