Blood glucose refers to the amount of sugar (glucose) present in a person's bloodstream. Glucose is an essential source of energy for our body, and it comes from the food we eat which gets broken down into glucose by our digestive system. The pancreas produces insulin, a hormone that helps regulate blood sugar levels by allowing cells in the body to take up glucose from the bloodstream. When blood glucose levels rise after eating, such as after a meal, the pancreas releases more insulin to help lower the level back to normal range. Blood glucose levels are an important indicator of overall health and can be used to diagnose conditions like diabetes or hypoglycemia (low blood sugar).