What role does Glukose play in blood sugar?

Glucose is the primary sugar in blood and the main energy source for cells. After a meal, blood glucose rises, triggering insulin release from the pancreas, which facilitates glucose uptake into tissues. During fasting or exercise, glucose is released from the liver via glycogenolysis and gluconeogenesis, regulated by glucagon and other hormones. Chronic high fasting glucose (≥126 mg/dL) or elevated HbA1c (≥6.5 %) indicates diabetes. While genetic variants (e.g., TCF7L2) have small effects on glucose regulation, they are not predictive alone. Lifestyle factors—diet, physical activity, weight—dominate. Consumer tests reporting 'genetic risk' for high blood sugar should be interpreted cautiously; they do not replace clinical glucose or HbA1c measurements. The role of glucose in blood sugar is well-established with strong human evidence.