Advancements in nutritional support for critically ill patients

Area of Science:

• Critical Care Medicine
• Nutritional Physiology
• Metabolic Regulation

Background:

• Critically ill patients often require nutritional support to prevent malnutrition.
• The timing, route, and composition of nutritional support are debated.
• Acute critical illness presents unique metabolic challenges, including anabolic resistance.

Purpose of the Study:

• To review clinical evidence on nutritional support in critically ill patients.
• To explore underlying (patho)physiological mechanisms of nutritional interventions.
• To identify future research directions in this field.

Main Methods:

• Systematic review of large randomized controlled trials.
• Analysis of physiological data related to nutritional support.
• Synthesis of evidence on short- and long-term patient outcomes.

Main Results:

• Early nutrition, regardless of route, demonstrates dose-dependent harm in critically ill patients.
• High-dose amino acids administered early are particularly harmful.
• Harm is linked to suppressed autophagy and ketogenesis, worsened hyperglycemia, and increased urea cycle activity.

Conclusions:

• Early high-dose nutrition must be avoided in all critically ill patients.
• Optimal timing, composition, and dosing of nutrition remain undetermined.
• Future research should focus on activating repair pathways without prolonged starvation and preventing hyperglycemia.