Blood Glucose
Overview
Blood glucose (혈당, Blood Glucose) refers to the concentration of glucose contained in the blood. Glucose is the main energy source for the human body and is essential for all cells, including the brain and muscles, to maintain function. Blood glucose levels are precisely regulated by hormones (insulin, glucagon, etc.), and when they deviate from the normal range, hypoglycemia or hyperglycemia can occur, leading to various health problems. It is particularly used as the most important biomarker for the diagnosis and management of diabetes mellitus.
Main Content
1. Physiological Regulation of Blood Glucose
Blood glucose fluctuates due to various factors such as diet, exercise, stress, and sleep. After a meal, carbohydrates are digested and converted into glucose, causing blood glucose to rise. Insulin, secreted by the beta cells of the pancreas, helps cells absorb glucose, thereby lowering blood glucose. Conversely, when blood glucose drops during fasting or exercise, alpha cells secrete glucagon, which converts stored glycogen in the liver into glucose, raising blood glucose. In addition, cortisol, epinephrine, growth hormone, and others are involved in blood glucose regulation.
2. Normal Blood Glucose Levels and Diagnostic Criteria
Generally, a fasting blood glucose level of 70–100 mg/dL is considered normal. Levels of 100–125 mg/dL are classified as impaired fasting glucose (prediabetes), and levels of 126 mg/dL or higher are diagnosed as diabetes. Postprandial blood glucose (2 hours after a meal) is normal below 140 mg/dL, 140–199 mg/dL indicates impaired glucose tolerance, and 200 mg/dL or higher is considered diabetes. Glycated hemoglobin (HbA1c) reflects the average blood glucose over the past 2–3 months, with normal below 5.7%, prediabetes at 5.7–6.4%, and diabetes at 6.5% or higher.
3. Hyperglycemia and Hypoglycemia
- Hyperglycemia: A state where blood glucose exceeds the normal range. If prolonged, it can lead to complications such as diabetic retinopathy, nephropathy, neuropathy, and cardiovascular disease. Acute hyperglycemia can lead to diabetic ketoacidosis (DKA) or hyperosmolar hyperglycemic state (HHS), requiring emergency treatment.
- Hypoglycemia: A state where blood glucose drops below 70 mg/dL, causing symptoms such as dizziness, cold sweats, palpitations, confusion, and loss of consciousness. Severe hypoglycemia can be life-threatening and commonly occurs in diabetes patients due to excessive use of insulin or oral hypoglycemic agents.
4. Methods of Blood Glucose Measurement
Self-monitoring of blood glucose (SMBG) involves analyzing capillary blood obtained from a fingertip using a blood glucose meter, and is essential for the daily management of diabetes patients. Recently, continuous glucose monitoring (CGM) has become widespread, allowing real-time monitoring of glucose concentration in the interstitial fluid. CGM is useful for identifying blood glucose fluctuation patterns and detecting hypoglycemia and hyperglycemia early.
5. Methods of Blood Glucose Management
- Dietary Therapy: A diet focused on low glycemic index (GI) foods, increased dietary fiber intake, and restriction of sugars and refined carbohydrates is important. The order of meals (vegetables → protein → carbohydrates) also helps mitigate blood glucose spikes.
- Exercise: Regular aerobic exercise and strength training improve insulin sensitivity and have a positive effect on blood glucose control.
- Medication: Type 1 diabetes requires insulin injections, while type 2 diabetes uses oral medications such as metformin and, if necessary, insulin in combination.
- Lifestyle Habits: Adequate sleep, stress management, smoking cessation, and moderate alcohol consumption contribute to blood glucose stabilization.
Latest Trends
As of 2024–2025, the field of blood glucose management is seeing notable advances in digital health technology. The accuracy of continuous glucose monitors (CGM) has significantly improved, and AI-based blood glucose prediction systems linked to smartphone apps have been commercialized, providing users with personalized advice based on diet, exercise, and sleep patterns. Additionally, non-invasive blood glucose measurement technologies (laser, optical sensors, etc.) have moved beyond clinical trial stages, with some products beginning to be released. In terms of medication, GLP-1 receptor agonists (semaglutide, tirzepatide, etc.) have shown excellent effects on weight loss and blood glucose control, changing the paradigm of diabetes treatment. These drugs have also demonstrated cardiovascular and renal protective effects, leading to a surge in prescriptions. Furthermore, research on the relationship between the gut microbiome and blood glucose regulation is actively ongoing, providing scientific evidence for personalized dietary therapy.
Related Topics
- [[Diabetes]]
- [[Insulin]]
- [[Hypoglycemia]]
- [[Glycated hemoglobin]]
- [[Continuous glucose monitor]]
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