This research identifies a specific immunometabolic vulnerability in intestinal group 3 innate lymphoid cells (ILC3s) triggered by a high-fat diet (HFD). Researchers discovered that within hours of fat consumption, microbiota-driven inflammation causes these cells to accumulate lipids while simultaneously suppressing their ability to process them through fatty acid oxidation. This metabolic imbalance leads to mitochondrial lipid peroxidation and rapid cell death, compromising the intestinal barrier and increasing susceptibility to pathogens. Notably, this depletion occurs independently of obesity or weight gain and is observed in both mice and humans. The study concludes that while this damage is severe, ILC3 populations can be restored by normalizing dietary fat intake.

References:

• Torrico E C, Kaptein P, Laalouhmi F, et al. High-fat diet causes rapid loss of intestinal group 3 innate lymphoid cells through microbiota-driven inflammation and mitochondrial stress[J]. Immunity, 2026.