Blood glucose, commonly known as blood sugar, is an important source of energy for the human body. It comes mainly from the food we eat and helps different organs and tissues perform their daily functions. Keeping blood glucose within a healthy range is important because both high and low blood sugar levels can affect overall health.

A blood glucose levels chart makes it easier to understand different blood sugar readings. It shows the general ranges considered normal, prediabetic, or diabetic and helps people understand when their readings may require medical attention.