Understanding blood glucose level ranges can be a key part of diabetes self-management. It is important that you control your blood glucose levels as well as you can as too high sugar levels for long periods of time increases the risk of diabetes complications developing. Diabetes complications are health problems which include: kidney disease, nerve damage, retinal disease, heart disease and stroke. This list of problems may look scary but the main point to note is that the risk of these problems can be minimised through good blood glucose level control. Small improvements can make a big difference if you stay dedicated and maintain those improvements over most days.