Local anesthesia: no need to fast.

Epidural anesthesia, spinal anesthesia, intravenous anesthesia, tracheal anesthesia, arm anesthesia, etc. At least six hours.

Time to resume eating after operation:

Local anesthesia: You can eat after operation.

Intravenous anesthesia can be used for eating after anesthesia (usually 2-4 hours).

Epidural anesthesia, spinal anesthesia, tracheal anesthesia and arm anesthesia for at least 6 hours. The specific time to eat depends on what surgery.