Sepsis, a life-threatening condition caused by the body’s response to infection, remains a major challenge in critical care. Recent research highlights the complex interplay between nutrition, gut health, and immune function in managing sepsis, with studies emphasizing the need for tailored dietary strategies and further clinical trials to clarify optimal approaches.
Sepsis, defined as life-threatening organ dysfunction from a dysregulated host response to infection, continues to pose significant challenges in intensive care units (ICUs). Mortality rates stay high despite treatment advances, showing the need for better strategies to manage its complicated effects. Nutrition therapy has become a key part of sepsis care, with studies looking at how diet affects patient outcomes.
Addressing Nutritional Needs in Sepsis
Delivering proper nutrition to septic patients is difficult because caloric and protein needs vary a lot based on each person’s condition. A review in the National Institutes of Health (NIH) journal stresses the need for personalized goals, especially using indirect calorimetry to measure resting energy expenditure (REE). But many patients don’t get enough calories. A global audit of 10,000 ICU patients found that nutritional intake often failed to meet targets, leaving most underfed.
Protein intake has been a main focus. A study cited in the NIH review found that low protein diets (less than 0.8 g/kg/day) linked to higher mortality in ventilated patients, while high protein intake during the first five days of ICU admission tied to increased long-term mortality. The best approach seems to involve slowly increasing protein levels, with the highest survival rates when intake rose from low to high by day five. The NIH also notes that glutamine supplements, once seen as promising, showed no benefit and even increased deaths in some cases.
Gut Microbiome’s Role in Immune Response
New research shows how diet affects the gut’s role in sepsis progression, particularly the link between dietary patterns, the gut microbiome, and immune function. A 2026 article from News Medical explains how fiber and microbial metabolites support intestinal and systemic immunity. But evidence that plant-rich diets prevent sepsis or improve survival is limited.
Short-chain fatty acids (SCFAs), made by gut bacteria breaking down fiber, help maintain the lining of the gut and control immune balance.
Clinical Trials on Nutritional Interventions
Trials on nutrition strategies have given conflicting results. The NIH review mentions the CALORIES trial, comparing enteral and parenteral feeding in critically ill patients. Both methods reached similar calorie goals, but most patients didn’t meet targets. Another trial, the EFFORT study, aims to settle the debate over high versus low protein intake, but results are not yet available.
Research on omega-3 polyunsaturated fatty acids (PUFAs) suggests possible benefits for oxygen exchange and weaning from ventilators in acute respiratory distress syndrome (ARDS) patients. The NIH article warns that the effect may depend on feeding method, lipid type, and route, with no clear agreement. Similarly, vitamin C’s role in reducing organ failure and inflammation in septic patients is being studied, with one study showing a positive effect on markers but no confirmed results.
Uncertainties remain. The News Medical article says the best glucose level for septic patients is unclear, and probiotics’ effectiveness in preventing infections is debated. Some studies show a drop in ventilator-associated pneumonia, but others warn about bloodstream infection risks in vulnerable patients.
Researchers stress the need for personalized nutrition plans. The NIH review says future trials must separate effects on feeding tolerance, infection risk, and organ damage, while finding which patients can benefit safely. For now, the connection between diet, gut health, and immune function in sepsis stays an active area of study, with potential to improve critical care outcomes.