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Early enteral nutrition reduces mortality in randomized trials of patients with traumatic brain injuryEarly nutrition may help patients with traumatic brain injuries

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Key Takeaway
Consider early enteral nutrition to improve nutritional status and reduce complications like VAP in TBI patients.

This meta-analysis evaluated the impact of early enteral nutrition (EEN), defined as initiation within 48 hours of injury, compared to delayed enteral nutrition (DEN) in 13,046 adults with traumatic brain injury. The analysis included a mix of randomized controlled trials and observational studies.

The primary outcome of short-term mortality showed no significant difference across all studies (RR = 0.64; 95% CI, 0.32 to 1.31). However, when limited specifically to randomized controlled trials, EEN was associated with a significant reduction in mortality (RR = 0.58; 95% CI, 0.35 to 0.96).

Secondary outcomes indicated that EEN was associated with significantly shorter mechanical ventilation duration and reduced ICU and hospital lengths of stay. Nutritional markers including serum albumin, glucose control, caloric intake, and positive nitrogen balance were markedly improved with EEN. Furthermore, lower rates of sepsis, central nervous system infection, stress ulcer, ventilator-associated pneumonia (VAP), and total adverse events were observed in the EEN group.

The authors noted heterogeneity as a limitation of the study. Clinically, while the inclusion of observational data diluted the mortality signal, the RCT-specific data suggest that early nutritional intervention may improve clinical outcomes and safety profiles for TBI patients.

How this fits prior evidence

This meta-analysis addresses gaps in management protocols for complications following traumatic brain injury. Specifically, it provides evidence regarding the role of enteral nutrition in reducing ventilator-associated pneumonia (VAP) rates, which relates to the shift toward multidimensional immune-microbiome models over biomechanical models for VAP in TBI patients.

When someone suffers a traumatic brain injury, the first few days are critical. Doctors often have to decide how quickly to start feeding patients through a tube (enteral nutrition). This study looked at over 13,000 patients to see if starting that nutrition early—within 48 hours of the injury—made a difference in their recovery.

For those who received early nutrition, the results were encouraging. These patients spent less time on breathing machines and had shorter stays in both the intensive care unit and the hospital. They also showed better nutritional markers, such as improved blood sugar control and higher protein levels. Most importantly, early feeding was linked to lower rates of serious complications like sepsis, lung infections from ventilators, and stomach ulcers.

While some data suggests that early nutrition might specifically help reduce death rates in certain types of clinical trials, the overall evidence across all studies was less clear on mortality. However, the consistent trend toward fewer complications and faster recovery times highlights why timing matters so much for patients facing a severe brain injury.

What this means for you:
Early nutritional support can reduce complications and shorten hospital stays for those with brain injuries.

Common questions

Does early feeding help with survival after a brain injury?

The results are mixed depending on the type of study. When looking at all studies together, there was no significant difference in mortality between early and delayed feeding. However, when looking only at randomized controlled trials, early nutrition showed a significant reduction in mortality.

What specific complications can early nutrition help prevent?

Patients who received nutrition within 48 hours of their injury had significantly lower rates of sepsis, central nervous system infections, stress ulcers, and ventilator-associated pneumonia. These are all serious complications that can occur during a hospital stay.

How does early feeding affect the length of hospital stays?

Patients who received enteral nutrition within 48 hours of their injury had shorter durations on mechanical ventilation and spent less time in both the intensive care unit and the hospital compared to those whose nutrition was delayed.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedJul 2026
View Original Abstract ↓
BackgroundSevere traumatic brain injury (TBI) induces a hypermetabolic state that heightens the risk of mortality and poor neurological outcomes. Early enteral nutrition (EEN), typically defined as initiation within 48 h of injury, is considered crucial, yet robust evidence of its specific benefits in TBI patients remains limited.MethodsFollowing PRISMA guidelines, we systematically searched the PubMed, Embase, Web of Science, and Cochrane Library databases through December 25, 2025, for studies comparing EEN with delayed enteral nutrition (DEN) in adults with TBI. Outcomes included clinical outcomes, nutrition status, and complications. Study quality was assessed using the Newcastle-Ottawa Scale and the Cochrane Risk of Bias tool. The primary outcome was short-term mortality, defined as from hospital admission to 90 days post-discharge. Sensitivity analyses and subgroup analyses explored heterogeneity.ResultsTen studies (6 randomized controlled trials [RCTs]; 4 observational; 13,046 patients) were included. When all studies (RCTs and observational) were pooled, there was no significant difference in short-term mortality risk between EEN and DEN (risk ratio [RR] = 0.64; 95% CI, 0.32–1.31). However, a prespecified sensitivity analysis limited to RCTs showed a significant reduction in mortality with EEN (RR = 0.58; 95% CI, 0.35–0.96). EEN significantly shortened mechanical ventilation duration and reduced both ICU and hospital length of stay. Nutritional status, including serum albumin levels, glucose control, caloric intake, and positive nitrogen balance, was markedly improved with EEN, without increasing hospitalization costs. EEN also significantly lowered rates of sepsis, central nervous system infection, stress ulcer, ventilator-associated pneumonia, and total adverse events (all p values range from
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