Burn Nutrition: Enteral Feeding and Nutrient Supplementation

Overview¶

The burned patient's metabolism is greatly accelerated, with increased requirements for energy, carbohydrates, proteins, fats, vitamins, minerals, and antioxidants ^[3]. This hypermetabolic response to severe injury demands increased calorie and protein intake to blunt catabolism and the loss of lean muscle mass ^[5]. Caloric requirements after a major burn are higher than in any other major trauma or disease ^[4]. Nutrition is therefore not adjunctive in burn care; it is a core determinant of wound healing, infection risk, and survival.

Nutrition practice in burn injury requires a multifaceted approach aimed at providing metabolic support during a heightened inflammatory state, while accommodating the surgical and medical needs of the patient ^[1]. The therapy itself requires careful decision making regarding the safe use of enteral or parenteral nutrition and the aggressiveness of nutrient delivery, given the severity of the patient's illness and response to treatment ^[2]. Early nutrition by enteral feeding is regarded as vital ^[3], and the central debates in the field now concern not whether to feed but how to dose energy, which route to use, and which supplements earn their place.

Early Enteral Feeding¶

The enteral route is the route of choice because it is the most physiologic, the cheapest, and the safest, and its use prevents complications such as Curling ulcer, cholecystitis, and bacterial translocation ^[12]. The mechanistic case is long-standing: in an experimental burn model, immediate postburn enteral feeding could prevent hypermetabolism through preservation of gut mucosal integrity and prevention of excessive secretion of catabolic hormones ^[6]. With early feeding, gut integrity is preserved, leading to fewer gastrointestinal hemorrhages, less infectious complications, a reduction in consequent organ failures, and a reduction in the onset of sepsis ^[7]. Enteral feeding directly nourishes the gastrointestinal tract and may help reverse the defective gut barrier that accompanies burn shock ^[55].

The clinical-outcome evidence for early initiation is now substantial. A meta-analysis found that early enteral nutrition significantly reduced mortality (odds ratio 0.36; 95% CI 0.18 to 0.72) ^[7], and a later umbrella review drawing on overlapping trial evidence reported that early enteral nutrition could substantially reduce overall mortality (RR 0.36; 95% CI 0.19 to 0.68, GRADE moderate certainty), hospital stay, and sepsis risk ^[9]. Patients receiving early enteral nutrition had a reduction in length of hospital stay of roughly 3.7 days in one pooled analysis ^[10]. On the basis of this evidence, one review described early enteral nutrition within 24 hours of admission as the preferred practice ^[14], and survey data confirm that gastric or enteral nutrition is initiated within 24 hours of admission in the services surveyed ^[49].

The timing benefit is not free of trade-offs. One meta-analysis found a higher incidence of diarrhea and vomiting, and decreased intestinal permeability, in the early-feeding group ^[10]. The evidence is therefore strong on direction but not uniform on tolerance, and the practical question of how aggressively to advance feeds remains a matter of bedside judgment.

Route of Delivery¶

Gastric and post-pyloric (duodenal or jejunal) access are both used. A review concluded that a duodenal approach, especially in the early postburn phase, seems superior to gastric feeding ^[13]. Nasojejunal tube feeding has been proposed for patients with significant burn injury who cannot tolerate nasogastric feeding ^[56], and one center has used continuous post-pyloric enteral nutrition during surgery as standard practice for more than 20 years ^[16]. The choice of route interacts directly with the decision to continue feeding through the operative period.

Perioperative Continuation¶

Burn patients return repeatedly to the operating room, and each fasting period erodes cumulative caloric balance. A 20-year single-center review confirmed the safety of intraoperative feeding: assessment of 434 patients revealed no incidence of aspiration ^[17]. A meta-analysis found that intraoperative enteral nutrition may increase nutritional intake without an increase in complications, though it cautioned that this conclusion rests on limited studies ^[18]. Continuous intraoperative duodenal feeding during burn surgery appears safe in the pediatric burn population, with no reported episodes of aspiration ^[15]. For re-initiation after excision and grafting, a small trial showed that resuming enteral feeding at goal rate, rather than slowly, met a significantly greater percentage of caloric goals (99% versus 58%) in the 36 hours after surgery ^[24], with no incidences of emesis, aspiration, or ischemic bowel in either group ^[25].

Energy Requirements¶

Setting the energy target is the central technical problem of burn nutrition because both underfeeding and overfeeding carry costs. Indirect calorimetry, which measures resting energy expenditure directly, is the reference standard ^[22]. One review concluded that the use of indirect calorimetry is crucial to ensure the safety of nutritional support in burn patients and should be widely encouraged ^[22], and another recommended calculating nutritional requirements based on energy expenditure measured by indirect calorimetry ^[23]. The case for measurement over estimation is sharpened by the failure of predictive equations: for adult patients with severe burns, all commonly used equations for predicting resting energy expenditure are inaccurate, and one analysis recommended using the Toronto equation, the 1.5 Harris-Benedict equation, or the Ireton-Jones equation only as a reference when indirect calorimetry is unavailable ^[20].

Where formulas are used, historical practice provided calories at twice the resting energy expenditure predicted by the Harris-Benedict equations for patients with greater than 30% body surface area burns ^[53]. The best metabolic and nutritional results in a controlled model were obtained with diets containing 20% to 30% of calories as protein and a caloric intake that paralleled measured energy expenditure ^[52]. The dominant contemporary caution is against excess: indirect calorimetry can determine caloric requirements, but trophic feeding strategies are preferred in the initial resuscitative phase to prevent overfeeding while maintaining enteric and immune function ^[19].

Protein and Macronutrient Composition¶

Protein delivery is high in burn nutrition because the hypermetabolic response drives catabolism and lean-mass loss ^[5]. In a controlled model, animals receiving diets with more than 20% of calories as protein had reduced weight loss and muscle wasting and normalized serum albumin, while the best overall results came from 20% to 30% protein calories matched to measured energy expenditure ^[52]. Macronutrient composition also matters: a meta-analysis found that high-carbohydrate, high-protein, low-fat enteral feeds in patients with at least 10% TBSA burns might reduce the incidence of pneumonia compared with a low-carbohydrate, high-protein, high-fat diet ^[30]. One review summarizing current practice noted that enteral feeding started within the first 24 hours and containing a high-carbohydrate, low-fat composition was the favored approach ^[14].

Glutamine¶

Glutamine is the most-studied single supplement in burn nutrition, and its evidence arc is a cautionary tale about early enthusiasm. Plasma and muscle glutamine are depleted after acute burn injury, contributing to muscle wasting, weight loss, and infection, which provides the physiologic rationale for repletion ^[57]. Early controlled work suggested that supplementing glutamine granules with oral or tube feeding could abate the degree of glutamine depletion, promote protein synthesis, improve wound healing, and reduce hospital stay ^[31]. A Cochrane-style synthesis reported that glutamine, compared with an isonitrogenous control, reduced length of hospital stay (mean stay 5.65 days shorter) and reduced mortality (RR 0.25; 95% CI 0.08 to 0.78) ^[26], and another meta-analysis associated glutamine with a reduction in hospital mortality and in gram-negative bacteremia ^[33].

The picture then changed. The anticipated positive effects of glutamine on time to discharge, mortality, and bacteremias were disproved in the largest randomized controlled trial of glutamine supplementation in burns ^[27]. Subsequent meta-analyses have aligned with this reversal: one concluded that enteral glutamine may not improve mortality, although it may shorten length of stay and reduce wound infection ^[28], and another stated directly that, based on current data, the authors do not recommend the routine use of glutamine supplementation for hospitalized burn patients ^[29]. The evidence on length-of-stay benefit remains, but the mortality and infection signals that originally drove adoption did not survive the definitive trial.

Trace Elements and Antioxidants¶

Trace-element deficiencies are pronounced after major burns. Among critically ill patients, deficiencies are most severe in major burns, who suffer a specific copper deficiency ^[46], with substantial cutaneous losses of copper, selenium, and zinc through exudate. Early work in a burn model suggested that adding larger requirements of trace elements than previously reported may be beneficial after thermal injury ^[32]. Supplementation raises measured stores: trace-element supplementation was associated with higher circulating plasma and skin-tissue contents of selenium and zinc and improved antioxidant status ^[54].

The clinical-outcome evidence favors the parenteral route at therapeutic doses. A meta-analysis found that parenteral supplementation of combined trace elements was associated with a significant decrease in infectious episodes (weighted mean difference -1.25 episodes; 95% CI -1.70 to -0.80) ^[34], and a separate review concluded that the intravenous route appears the only way to deliver the doses required to achieve antioxidant and clinical effects ^[46]. The optimal regimens, dosages, and routes remain incompletely defined ^[34].

Vitamin D and Other Micronutrients¶

Vitamin D status is a distinct concern in burns. Low 25-hydroxyvitamin D has been observed in nearly all pediatric and most adult burn patients ^[37], reflecting both impaired cutaneous synthesis in injured skin and ongoing losses. A meta-analysis reported that patients with sufficient vitamin D levels or who received supplementation had significantly shorter overall hospitalization and burn intensive-care-unit stays ^[35], and its authors concluded that vitamin D management may improve clinical outcomes and should be considered in future guidelines ^[36]. The preferred dose, formulation, and route remain unknown, and data linking vitamin D status to hard clinical outcomes are limited ^[37].

Immunonutrition, Omega-3, and Other Supplements¶

Beyond glutamine and trace elements, a cluster of immune-modulating nutrients has been studied with mixed results. The use of glutamine, arginine, essential fatty acids, and other nutritional factors for their effects on immunity and cell regulation is becoming more common, although the evidence often lags behind the practice ^[1]. For omega-3 fatty acids the data conflict: one meta-analysis found that omega-3 polyunsaturated fatty acids may reduce inflammatory response and the risk of sepsis, septic shock, and multiple organ dysfunction syndrome and may shorten hospital stay but cannot reduce mortality ^[38], while another found no benefit of omega-3 support in reducing complications, mortality, or length of stay ^[39]. Ornithine alpha-ketoglutarate (OKG) supplementation of enteral feeding has been reported to significantly shorten wound-healing time in severe burn patients ^[40], with reviews describing replenishment of glutamine and arginine pools, improved nitrogen balance, and preserved muscle mass ^[41]. Across broad syntheses, however, combined immunonutrition, branched-chain amino acids, fish oil, and OKG did not significantly affect the assessed clinical outcomes ^[9].

Assessment and Monitoring¶

Monitoring nutrition in burns is harder than in most patient groups because the markers themselves are perturbed by injury. Assessing micronutrient status after burn injury is difficult because of hemodilution in the resuscitation phase, redistribution of nutrients from the serum to other organs, and decreases in carrier proteins such as albumin ^[44]. Transthyretin (prealbumin) values must be interpreted with reservation because they are altered by inflammatory activity ^[45]. Nutritional assessment tools tend to over- or underestimate resting energy expenditure, and the Milner equation was identified as the most accurate alternative when indirect calorimetry is unavailable ^[14].

Feeding tolerance is commonly judged at the bedside by gastric residual volumes, but practices vary widely and elevated residuals are a frequent cause of enteral-nutrition interruption ^[42]. Importantly, elevated gastric residual volumes do not equate to gastrointestinal intolerance and do not always reflect aspiration risk ^[42]. For risk stratification, the modified NUTRIC score has been shown to be an effective nutrition-risk screening tool among severely burned patients ^[43].

Special Populations¶

Pediatric burns have been a focus of timing research. In one randomized trial, 77 children in intensive care with burns involving more than 25% of total body surface area were assigned to enteral nutrition within 24 hours or after at least 48 hours ^[11]. Best practices for the timing and form of nutrition in critically ill infants and children remain incompletely defined ^[8]. Glycemic targets differ by age: moderate glucose control appears safe in adult burns, but data in children remain uncertain because the risk of hypoglycemia seems higher ^[47]. In older adults, reviews note high shock and mortality rates and wounds that do not heal easily, and address nutrition support as one element of a broader management approach ^[48]. For patients with obesity, most surveyed services believe a different nutritional approach is warranted, with specific emphasis on avoiding overfeeding ^[49].

Adjuncts that Modulate the Nutritional Target¶

Pharmacologic modulation of the hypermetabolic response is closely intertwined with nutrition because it changes the energy and protein target the diet must meet. A meta-analysis found that propranolol significantly decreased resting energy expenditure and trunk fat after burn injury ^[50], and reviews emphasize early enteral nutrition, continuation of feeding during surgical procedures, and adjuncts such as immunonutrition and beta-blockade as components of integrated metabolic care ^[58]. These agents are covered in depth on their own pages; here they are relevant because they lower the metabolic demand that nutrition is asked to satisfy.

Controversies and Evidence Gaps¶

The most instructive controversy in burn nutrition is glutamine. A decade of meta-analyses suggested mortality and infection benefit, yet those signals were disproved in the largest randomized trial ^[27], and current syntheses no longer support routine use ^[29]. The evidence on early enteral feeding is comparatively robust on the direction of benefit, with multiple meta-analyses converging on reduced mortality and length of stay ^[7][9], yet older syntheses cautioned that the benefit on standardized outcomes remained inconclusive and insufficient to provide clear guidelines for practice ^[51]. The optimal energy target is unsettled in the sense that indirect calorimetry is endorsed as the reference standard ^[22] while predictive equations remain inaccurate ^[20], leaving centers without calorimetry to estimate. Intraoperative feeding appears safe and improves caloric balance, but randomized trials are still needed before firm recommendations on intraoperative practice can be made ^[18]. Vitamin D, omega-3 fatty acids, and other micronutrients are physiologically attractive but rest on weak outcome evidence ^[38][39]. Trace-element supplementation reduces infectious episodes by the parenteral route ^[34], yet the optimal regimens, dosages, and routes are not defined.

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