Inclusion Criteria:

• Adults (≥18 years of age)
• With critical illness (hospitalized in an intensive care unit with a status of "ICU")
• Who have received orders for continuous enteral nutrition

Exclusion Criteria:

• "Comfort Measures Only" status
• Have orders to receive trickle feedings (feeding rate ≤10mL/hr)
• Recent surgical procedure on the GI tract (within previous 5 days at time of recruitment) or admission for GI bleed
• Receiving continuous sedation
• Expected to undergo a procedure requiring removal of study devices in the three days following enrollment
• History of malabsorptive bariatric surgery
• Admitted for a burn injury
• Known intolerance to feeding rates >100mL/hr
• Current diagnosis of pancreatitis, ileus or gastroparesis (only if using a gastrostomy tube)
• Requiring intermittent or continuous renal replacement therapy
• Pregnant or lactating
• On an intermittent feeding schedule
• Nutritional needs would require a rate higher than 120mL/hr on TRF12 protocol
• Lack of clearance by primary physician