Healthy Volunteers Enteral Nutrition Study (HEN)

Inclusion Criteria:

1. Must be able to read and understand English
2. Must be able to sign a consent form for the study

Exclusion Criteria:

1. BMI \<20 or \>30
2. Unintentional weight loss of \>10% in the last 3-6 months
3. Kidney disease
4. Diagnosis of cirrhosis
5. Taking diuretics
6. Anemia - Hemoglobin \<lower limit of normal in men or \<10 g/dL in women.
7. Taking iron supplements within 2 weeks for Visit 2.1
8. Taking prebiotic or probiotic supplements or any supplement including a multivitamin within 2 weeks of Visit 2.1
9. Taking antibiotics less than 4 weeks prior to Visit 2.1
10. Diarrhea in the 2 weeks prior to Visit 2.1
11. Diabetes mellitus
12. Diagnosis of congestive heart failure
13. Diagnosis of inflammatory bowel disease or celiac disease
14. Bowel resection other than an appendectomy
15. Pregnancy or breastfeeding
16. Intolerance or allergy to nutritional formula, chicken, eggs, apples, banana, potatoes
17. Using protein supplements, including powder added to food or drinks within 2 weeks of Visit 2.1
18. Baseline bowel frequency less than every 2 days or greater than 3 times daily
19. Student or employee of any one of the investigators.
20. Anyone who cannot receive study payment (e.g. visa constraints).
21. Any condition that the investigator feels may limit the volunteer's ability to complete the study protocol.