Blood glucose refers to the amount of sugar, or glucose, present in the bloodstream. Glucose is a primary source of energy for the body's cells and is derived from the food we eat, particularly carbohydrates. The body regulates blood glucose levels through hormones, primarily insulin, which helps cells absorb glucose for energy. Maintaining balanced blood glucose levels is crucial for overall health. High levels can lead to conditions like diabetes, while low levels can cause symptoms such as dizziness and confusion. Regular monitoring of blood glucose is important for individuals with diabetes to manage their condition effectively.