Diabetes Mellitus - Symptoms, Causes, Treatment & Prevention

Overview

Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose (blood sugar) levels due to impaired insulin production, insulin function, or both. Insulin, produced by the pancreas, regulates blood sugar absorption into cells. Approximately 537 million adults (ages 20–79) live with diabetes globally, with projections rising to 643 million by 2030 (IDF Diabetes Atlas). In the U.S., 11.6% of the population has diabetes, and about 38% of adults have prediabetes (CDC, 2023). Types include:

• Type 1 Diabetes: Autoimmune destruction of insulin-producing cells (5–10% of cases)
• Type 2 Diabetes: Insulin resistance and progressive insulin deficiency (90–95% of cases)
• Gestational Diabetes: Develops during pregnancy (2–10% of pregnancies)

Rare forms include monogenic diabetes and diabetes from pancreatic disorders.

Symptoms

• Increased thirst and urination: Excess glucose draws water into urine, causing dehydration.
• Unexplained weight loss: Cells can't access glucose for energy, burning fat/muscle instead.
• Fatigue: Due to insufficient glucose utilization by cells.
• Blurred vision: appreciationissues">High blood sugar causes fluid shifts in eye lenses.
• Slow-healing wounds: Hyperglycemia impairs immune function and blood flow.
• Frequent infections: Urinary tract, yeast, or skin infections due to glucose-rich tissues.
• Tingling/numbness: Early nerve damage (neuropathy) sign, often in hands/feet.
• Hunger despite eating: Cells signal energy shortage despite high blood glucose.

Symptoms develop rapidly in Type 1 diabetes but gradually in Type 2 (sometimes asymptomatic for years).

Causes and Risk Factors

Causes:

• Type 1: Autoimmune destruction of pancreatic beta cells; triggers include genetics and environmental factors (e.g., viruses).
• Type 2: Insulin resistance combined with beta-cell dysfunction, linked to obesity and lifestyle.
• Gestational: Hormonal changes cause insulin resistance during pregnancy.

Risk Factors:

• Type 1: Family history, genetic markers (HLA genes), geography (higher latitudes).
• Type 2: Obesity (BMI ≥25), physical inactivity, family history, age ≥45, gestational diabetes history.
• Ethnicity: Higher risk in African American, Hispanic/Latino, Native American, and Asian populations.
• Other: PCOS, high blood pressure, HDL ≤35 mg/dL, or triglycerides ≥250 mg/dL.

Diagnosis

Diagnosis requires one abnormal test result in symptomatic patients or two in asymptomatic cases (ADA Standards, 2023 vantagessess):

• Fasting Plasma Glucose (FPG): ≥126 mg/dL after 8-hour fast.
• HbA1c: ≥6.5% reflects average blood sugar over 2-3 months.
• Oral Glucose Tolerance Test (OGTT): ≥200 mg/dL 2 hours post-drink.
• Random Blood Glucose: ≥200 mg/dL with symptoms.

Prediabetes ranges: HbA1c 5.7–6.4% or FPG 100–125 mg/dL.

Treatment Options

Medications:

• Insulin Therapy (Essential for Type 1): Injectable basal/bolus regimens or pumps.
• Type 2 Medications: Metformin (first-line), SGLT2 inhibitors, GLP-1 agonists, DPP-4 inhibitors, or sulfonylureas.

Lifestyle Interventions:

Carbohydrate-counting: Consistent carb intake paired with activity.

Exercise: 150 minutes/week moderate activity improves insulin sensitivity.

Weight loss: 5–7% reduction reduces diabetes progression risk by 58% in prediabetes (CDC).

Procedures: