When your blood sugar balance is good, the risk of nerve damage is low. Consequently, the most important measure to prevent nerve damage is to keep your blood sugar balance as good as possible. If nerve damage has already taken place, good blood sugar treatment can prevent it from progressing.
The measures you can take to prevent the progress of nerve damage include not smoking or consuming copious amounts of alcohol and treating high blood pressure and lipid disorders. Exercise is also a good way to prevent nerve damage.