Inclusion Criteria:  • Healthy individual > 18 years of age with no comorbidities  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, thyroid disorder Neurological disorders Chronic gastrointestinal disease Any subject with upper GI symptoms like pain, burning, belching, bloating, dysphagia & aerophagia