Inclusion Criteria:  Patient 18 years old and above Agree to participate  Exclusion Criteria:  History of upper gastrointestinal surgery Patient with active gastrointestinal bleeding Unstable clinical condition Mentally disable or who cannot give an informed consent Patient on the nasogastric feeding tube Pregnant patient American Society of Anesthesiologists classification of physical status grade 3 or above Insulin dependent Diabetes Mellitus more than 10 years Patient who is carbohydrate intolerance