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NIDDM – Type 2 Diabetes: Causes, Symptoms, Treatment

NIDDM (Non-Insulin-Dependent Diabetes Mellitus) is the older term for type 2 diabetes, a chronic metabolic disease characterized by elevated blood glucose levels.

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Things worth knowing about "NIDDM"

NIDDM (Non-Insulin-Dependent Diabetes Mellitus) is the older term for type 2 diabetes, a chronic metabolic disease characterized by elevated blood glucose levels.

What is NIDDM?

NIDDM stands for Non-Insulin-Dependent Diabetes Mellitus and is the former medical term for the condition now widely known as type 2 diabetes mellitus. The designation was officially replaced by the World Health Organization (WHO) in the 1990s because it proved misleading in practice – many patients with this condition do eventually require insulin therapy as their disease progresses. NIDDM is one of the most prevalent chronic diseases worldwide and is defined by persistently elevated blood glucose levels (hyperglycemia) resulting from impaired insulin action or secretion.

Causes

The disease arises from a combination of genetic predisposition and lifestyle-related factors. Two core mechanisms are involved:

Insulin resistance: Body cells become less responsive to insulin, preventing adequate glucose uptake from the bloodstream.
Beta-cell dysfunction: The pancreas gradually loses its ability to produce sufficient insulin to compensate for the resistance.

Key risk factors include:

Overweight and obesity (especially abdominal fat)
Physical inactivity
Unhealthy dietary habits
Family history of diabetes (genetic predisposition)
Older age (risk increases significantly after age 45)
History of prediabetes or gestational diabetes

Symptoms

NIDDM typically develops slowly over many years. In the early stages, many individuals experience few or no noticeable symptoms. Common signs may include:

Excessive thirst and frequent urination
Unexplained fatigue and lethargy
Blurred vision
Slow-healing wounds or sores
Recurrent infections (e.g., urinary tract or skin infections)
Tingling, numbness, or pain in the hands and feet

Diagnosis

Diagnosis is established through blood tests. The following tests are used in clinical practice:

Fasting plasma glucose: A value of ≥ 126 mg/dL (7.0 mmol/L) on two separate occasions is diagnostic.
HbA1c (glycated hemoglobin): A level of ≥ 6.5% indicates diabetes.
Oral glucose tolerance test (OGTT): Blood glucose measured 2 hours after ingesting a standard glucose load; a value of ≥ 200 mg/dL confirms diabetes.
Random plasma glucose: A value of ≥ 200 mg/dL in the presence of classic symptoms is sufficient for diagnosis.

Treatment

Management of NIDDM (type 2 diabetes) is individualized and follows a stepwise approach depending on disease severity and patient profile.

Lifestyle Modifications

Lifestyle changes form the cornerstone of treatment:

Weight reduction through a balanced, low-glycemic, fiber-rich diet
Regular physical activity (at least 150 minutes of moderate-intensity exercise per week)
Smoking cessation and reduction of alcohol consumption

Pharmacological Therapy

When lifestyle changes alone are insufficient, medications are prescribed:

Metformin: First-line medication that improves insulin sensitivity and reduces hepatic glucose production
SGLT-2 inhibitors (e.g., empagliflozin): Promote urinary glucose excretion and offer cardiovascular benefits
GLP-1 receptor agonists (e.g., semaglutide): Enhance insulin secretion, reduce appetite, and support weight loss
Sulfonylureas, DPP-4 inhibitors, insulin: Additional options used depending on disease progression

Long-Term Complications

Poorly controlled or untreated type 2 diabetes can lead to serious complications, including:

Cardiovascular disease (heart attack, stroke)
Diabetic nephropathy (kidney damage leading to chronic kidney disease)
Diabetic retinopathy (retinal damage with risk of blindness)
Diabetic foot syndrome (impaired wound healing, risk of amputation)
Peripheral neuropathy (nerve damage causing pain or numbness)

References

World Health Organization (WHO): Definition and Diagnosis of Diabetes Mellitus and Intermediate Hyperglycemia. WHO Press, Geneva, 2006.
American Diabetes Association (ADA): Standards of Medical Care in Diabetes 2024. Diabetes Care, 47(Suppl. 1), 2024.
Zheng, Y., Ley, S. H., Hu, F. B.: Global aetiology and epidemiology of type 2 diabetes mellitus and its complications. Nature Reviews Endocrinology, 14(2), 88–98, 2018.

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