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Type 2 Diabetes – Causes, Symptoms and Treatment

Type 2 diabetes is a chronic metabolic disease in which the body can no longer use insulin effectively, leading to persistently elevated blood sugar levels.

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Things worth knowing about "Type 2 Diabetes"

Type 2 diabetes is a chronic metabolic disease in which the body can no longer use insulin effectively, leading to persistently elevated blood sugar levels.

What Is Type 2 Diabetes?

Type 2 diabetes mellitus is a chronic metabolic condition in which the body's cells no longer respond adequately to the hormone insulin – a state known as insulin resistance. Insulin is produced by the pancreas and enables glucose (sugar) to move from the bloodstream into cells, where it is used for energy. In type 2 diabetes, this process is impaired, causing blood glucose levels to remain persistently elevated, a condition known as hyperglycemia. Type 2 diabetes is the most common form of diabetes and affects hundreds of millions of people worldwide.

Causes and Risk Factors

The development of type 2 diabetes is multifactorial, meaning that several factors contribute to its onset:

Overweight and obesity: Excess body fat, especially around the abdomen, significantly promotes insulin resistance.
Physical inactivity: A sedentary lifestyle reduces the sensitivity of muscle cells to insulin.
Unhealthy diet: A diet high in sugar, saturated fats, and low in fiber increases the risk of developing the disease.
Genetic predisposition: A family history of diabetes considerably raises an individual's risk.
Age: Risk increases after the age of 45, although the disease is increasingly observed in younger people as well.
High blood pressure and lipid disorders: These conditions frequently co-occur with type 2 diabetes.
Sleep deprivation and chronic stress: Both can negatively affect blood glucose regulation.

Symptoms

Type 2 diabetes often develops gradually over many years and may go unnoticed for a long time. Common symptoms include:

Frequent urination (polyuria)
Excessive thirst (polydipsia)
Persistent fatigue and lack of energy
Blurred vision
Slow wound healing
Frequent infections (e.g., urinary tract or skin infections)
Tingling or numbness in the hands and feet (peripheral neuropathy)

Many people are unaware they have the condition, which makes regular screening examinations particularly important.

Diagnosis

Type 2 diabetes is diagnosed through blood tests. The following tests are commonly used:

Fasting blood glucose: A level of 126 mg/dL (7.0 mmol/L) or higher after at least 8 hours of fasting is considered diagnostic.
HbA1c (glycated hemoglobin): A value of 6.5% or higher indicates diabetes. It reflects average blood glucose levels over the previous 2–3 months.
Oral glucose tolerance test (OGTT): Blood glucose is measured 2 hours after drinking a glucose solution. A result of 200 mg/dL or above is diagnostic.

Treatment

Lifestyle Modifications

Lifestyle changes form the cornerstone of type 2 diabetes management:

Weight loss: Even modest weight reduction can significantly improve insulin sensitivity.
Regular physical activity: At least 150 minutes of moderate-intensity exercise per week (e.g., walking, cycling, swimming) is recommended.
Balanced diet: Emphasis on whole grains, vegetables, legumes, and healthy fats, with reduced intake of sugar and processed foods.

Medication

When lifestyle changes alone are insufficient, medications are prescribed:

Metformin: The first-line medication that improves insulin action in the liver.
SGLT-2 inhibitors (e.g., empagliflozin): Lower blood glucose through the kidneys and have proven cardiovascular protective effects.
GLP-1 receptor agonists (e.g., semaglutide): Stimulate insulin secretion and support weight loss.
Sulfonylureas, DPP-4 inhibitors, and other drug classes may also be used depending on individual needs.
Insulin therapy: Required in advanced stages or when other medications are no longer sufficient.

Long-Term Complications

Inadequately controlled diabetes can lead to serious complications, including:

Heart disease and stroke (cardiovascular disease)
Kidney damage (diabetic nephropathy)
Nerve damage (diabetic neuropathy)
Eye damage and potential blindness (diabetic retinopathy)
Diabetic foot syndrome and amputations

Prevention

In many cases, type 2 diabetes can be prevented or significantly delayed through a healthy lifestyle. Maintaining a balanced diet, engaging in regular physical activity, and avoiding excess weight are the most effective preventive measures.

References

World Health Organization (WHO) – Diabetes Fact Sheet (2023). Available at: https://www.who.int/news-room/fact-sheets/detail/diabetes
American Diabetes Association – Standards of Medical Care in Diabetes 2024. Diabetes Care, 47(Suppl 1), S1–S321.
International Diabetes Federation (IDF) – IDF Diabetes Atlas, 10th Edition (2021). Available at: https://www.diabetesatlas.org

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