Inclusion Criteria:  Age 18-85 No prior surgical history Asymptomatic according to gastroesophageal and gastric questionnaires Not currently taking any medications that affect acid secretion or gut motility No history of malignancy No mental health issues precluding informed consent No smoking history No excessive or daily alcohol use BMI < 30 No known hiatus hernia No known medical illness (autoimmune, neurological) that could be associated with altered esophageal or gastric function Not allergic to fentanyl or versed No history of eating disorder No history of autoimmune disorders  Exclusion Criteria:  Minors Surgeries involving the GI tract Medication use affecting acid secretion or gut motility Personal history of malignancy Mental health issues precluding informed consent Symptoms on standard clinical questionnaires Pregnant - the effect that pregnancy has on esophageal and gastric motility is not well defined, but we will need to eliminate this as a confounding factor Nursing women - although the investigations are FDA approved and part of standard clinic practices, they are time consuming and involve medication administration that might affect the ability of a mother to nurse