There could be many causes for high blood sugar, especially if it is consistently high. It may be due to heredity; or it can be due to stress. It could be due to a consistently poor diet and lack of exercise. If you have high blood sugar, try to eat a balanced diet and get regular exercise. Even a brisk walk will help. If you have a family history of diabetes, you may want to use a nutritional supplement like GlucoVert Blood Sugar Matrix which will provide nutrients that can help sustain healthy glucose levels.