Overview
Type 2 Diabetes Mellitus (T2DM) is a chronic metabolic disorder characterized by high blood glucose levels due to insulin resistance and/or insufficient insulin production. In this condition, the body’s cells do not respond properly to insulin, a hormone that regulates blood sugar, leading to elevated glucose levels in the bloodstream.
It is the most common form of diabetes, accounting for around 90–95% of diabetes cases worldwide.
Causes and Risk Factors
Type 2 diabetes develops gradually and is influenced by a combination of genetic, lifestyle, and environmental factors.
Major risk factors include:
- Overweight and obesity, especially abdominal fat
- Sedentary lifestyle and lack of physical activity
- Unhealthy diet high in sugar and processed foods
- Family history of diabetes
- Age above 40 years (though increasingly seen in younger individuals)
- High blood pressure and abnormal cholesterol levels
- History of gestational diabetes
Pathophysiology
In Type 2 diabetes:
- The body becomes resistant to insulin, meaning cells do not respond effectively to insulin signals.
- The pancreas initially produces more insulin to compensate.
- Over time, the pancreatic beta cells become unable to maintain adequate insulin production, resulting in persistent high blood sugar levels.
Common Symptoms
Symptoms often develop gradually and may go unnoticed for years. Common signs include:
- Frequent urination
- Increased thirst
- Excessive hunger
- Fatigue and weakness
- Blurred vision
- Slow healing of wounds
- Frequent infections
Complications
If poorly controlled, Type 2 diabetes can lead to serious long-term complications:
- Cardiovascular diseases (heart attack, stroke)
- Kidney disease (diabetic nephropathy)
- Nerve damage (diabetic neuropathy)
- Eye damage (diabetic retinopathy)
- Foot ulcers and amputations
Diagnosis
Type 2 diabetes is diagnosed through blood tests such as:
- Fasting Blood Glucose Test
- HbA1c Test (average blood sugar over three months)
- Oral Glucose Tolerance Test (OGTT)
- Random Blood Glucose Test
Management and Treatment
Although Type 2 diabetes cannot usually be cured, it can be effectively managed through lifestyle changes and medication.
Key management strategies include:
Lifestyle Modifications
- Balanced diet with controlled carbohydrate intake
- Regular physical activity
- Weight management
- Stress control and adequate sleep
Medications
- Oral antidiabetic drugs (e.g., metformin)
- Injectable medications (GLP-1 receptor agonists, insulin in advanced cases)
Prevention
Many cases of Type 2 diabetes can be prevented through healthy lifestyle habits:
- Maintaining a healthy weight
- Regular exercise
- Consuming a balanced diet rich in whole foods
- Avoiding excessive sugar and processed foods
Conclusion
Type 2 diabetes is a growing global health concern linked closely to lifestyle and metabolic factors. Early detection, healthy living, and proper medical management are crucial for controlling blood sugar levels and preventing serious complications.
