The normal value of fasting blood glucose should not be greater than 7.0 mmol/L. If fasting blood glucose is high, the individual may have diabetes and needs to undergo an oral glucose tolerance test at the hospital. A myoglobin test is also performed, so that the medication can be adjusted in a targeted manner and the individual can avoid blood sugar fluctuations as much as possible. Normally, the blood glucose should be low in the fasting state because the body consumes too many nutrients. If fasting blood glucose is high and continues for a long time, it may lead to neurological symptoms, especially in the terminal nerves of the extremities. This may lead to numbness and tremors in the hands and feet, and in severe cases, gangrene in the extremities and loss of normal motor functions. Timely treatment is needed to avoid complications, and dietary adjustments can also be made to restore blood glucose levels as much as possible.