Blood glucose levels refer 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, especially carbohydrates. Normal blood glucose levels typically range from 70 to 100 mg/dL when fasting and can rise after meals. Maintaining balanced blood glucose levels is crucial for overall health. Insulin, a hormone produced by the pancreas, helps regulate these levels by facilitating the uptake of glucose into cells. Abnormal levels can lead to conditions such as diabetes, where the body either does not produce enough insulin or cannot effectively use it.