Inclusion Criteria:

1.Non-pregnant, non-breastfeeding females

2.18 years of age or older

3.Body mass index between 20 and 32 kg/m2

4.No alarm indicators on clinical assessment (weight loss of more than 7kg, bleeding, recent recurrent vomiting, progressive dysphagia).

5.No history suggestive of small bowel obstruction

Exclusion Criteria:

1. Patients who have any gastrointestinal symptoms. Do not fulfill the criteria for the irritable bowel syndrome or functional dyspepsia clinically
2. Patients with a clinical diagnosis of gastroparesis or an alternative underlying disease that could be responsible for disturbed gastric function e.g. diabetes, post-vagotomy, post-fundoplication
3. Abdominal surgery other than appendectomy, cholecystectomy, hysterectomy, caesarian section or tubal ligation
4. Positive symptoms on an abridged bowel disease questionnaire
5. Use of medications that may alter gastrointestinal motility including metoclopramide, domperidone, tegaserod; acetaminophen and ibuprofen will be allowed
6. Current use of medications which may interact with the study medications
7. Patients who have taken any investigational medications within the past 30 days
8. Over the counter medication (except multivitamins) within 7 days of the study
9. Chronic gastrointestinal illness or any systemic disease that could affect gastrointestinal motility for controls
10. Known intolerance or allergy to eggs, milk and Ensure
11. History of chronic diarrhea