How are Insulin and blood sugar related?

Insulin and blood sugar are linked through a classic hormonal feedback loop. After eating, blood glucose rises, triggering the pancreas to release insulin. Insulin enables cells (muscle, fat, liver) to take up glucose from the blood, thereby lowering blood sugar. It also suppresses glucose production by the liver. In metabolic disorders like type 2 diabetes, this system fails: cells become insulin resistant, blood sugar stays high, and the pancreas overproduces insulin until it eventually burns out. DNA tests (e.g., for TCF7L2 variants) can indicate a slightly elevated risk for diabetes but cannot diagnose the condition. The core relationship is well-established human physiology (evidence: human-strong). For personalized advice, blood tests (fasting glucose, HbA1c, insulin) are essential.