For normal healthy subjects:

Inclusion Criteria:

1. Male or female patients who are 18 years of age to 72 years of age.
2. Normal healthy subjects with no signs or symptoms of gastrointestinal discomfort.

Exclusion Criteria:

Patients will not be included in this study if they are:

1. < 18 years of age or >72 years of age
2. Subjects with known gastrointestinal or liver cancers, pancreaticobiliary tract diseases, active peptic ulcer disease or uncontrolled lactose intolerance.
3. Subjects with cardiovascular, pulmonary disorders, or subjects with diabetes mellitus, a malignancy or who are known to be HIV positive.
4. Subjects with a history of gastric, intestinal or colonic resections. Subjects who are at less than a three month status for either: post appendectomy, cholecystectomy, or hysterectomy with or without oophorectomy.
5. Subjects who are unable to give informed consent or adequately express their subjective complaints.
6. Subjects who abuse drugs or alcohol.
7. Female subjects who are pregnant.

For functional dyspepsia patients:

Inclusion Criteria:

1. Male or female patients who are 18 to 72 years of age.
2. Patients who present with varying gastric complaints of discomfort
3. Patients who meet all Rome II criteria for functional dyspepsia (see Rome II criteria checklist)

Concomitant medications are allowed during the study period.