Can a gluten-free diet or nutrition help during or after sepsis?

A gluten-free diet is not a sepsis treatment. It matters only if the person actually has celiac disease, and then it matters for the gut and for recovery, not for surviving the infection.

The question is whether a gluten-free diet or nutrition helps during or after sepsis. Nothing in this evidence tested a gluten-free diet in septic patients. What it does show is narrower. In severely malnourished children, celiac-positive kids on a strict gluten-free diet gained weight while non-adherent kids lost it, 4.89 versus -0.49 grams per kilogram per day [2]. That is a malnutrition finding, not a sepsis finding, and the same study contradicts itself on whether the seropositive-versus-seronegative difference was significant [1][2].

For nutrition during critical illness, the evidence is a phased approach: adequate protein, restricted non-protein calories early, more calories during recovery [4]. Omega-3 enriched feeding showed mixed results across seven studies, with some sepsis and COVID benefit and no consistent effect elsewhere [5]. In mice with sepsis, changing dietary fat did not change survival at all [3].

My call: keep the gluten-free diet if the person has celiac disease, because untreated celiac means a damaged gut and poor absorption when they can least afford it, and focus nutrition on protein and calories during and after sepsis. Do not expect the diet itself to change sepsis survival. Confidence: moderate that gluten-free diet helps malnourished celiac patients recover nutritionally, low that it changes sepsis outcomes, and not clear on any specific nutrition protocol for sepsis.