Before your surgery you will be given instructions on when to stop eating and drinking. This will vary depending on the time and type of surgery you are having. The reason is that if there is food or liquid in your stomach during your anaesthetic, it could come up into the back of your throat and then go into your lungs. This would cause choking, or serious damage to your lungs.
You should always follow the advice given by your surgical or pre-operative assessment team.
It is important you follow this advice as your operation may be cancelled if you do not