Inclusion Criteria:  Healthy individual > 18 years of age Not on any acid lowering drug from at least 7 days.  Exclusion Criteria:  Thoracic or digestive foregut surgery, Alcohol consumption >40 g/day, Use of medications that alter intragastric acidity or oesophageal motility History of diabetes mellitus, Neurological disorders Chronic gastrointestinal disease Any subject with upper GI symptoms like pain, burning, belching, bloating, dysphagia & aerophagia