Timing of food may shape how T cells respond to infection and therapy

A new study reveals how lipids released after a meal can sustainably enhance T-cell metabolism, translation and immune performance, with implications for infection research and next-generation cell therapies.

Study: Postprandial lipid metabolism sustains T cell immunity. Image credit: Vink Fan / Shutterstock

In a recent study published in the journal Naturea group of researchers investigated how short-term postprandial nutritional status affects T cell metabolism, activation, and long-term immune function.

Postprandial Nutrition and T Cell Function

Can the timing of your last meal affect how effectively your body responds to an infection? The immune system is energy dependent and can be affected by small metabolic changes. T cells require considerable energy to activate, proliferate and kill pathogenic or abnormal cells.

While much research has been conducted on long-term eating patterns and nutrition over months and years, the short-term effects (postprandial effects) of food intake on the immune system are not well understood. This gap is important because there is a constant variation in nutrient availability with daily feeding cycles.

Understanding these rapid metabolic changes could inform future studies of vaccination, responses to infections and immunotherapies. Further research is needed to determine how short-term dieting affects immune cell function.

Fasted and Fed T Cell Study Design

The study analyzed immune responses in both humans and mice under fasting and postprandial conditions. Peripheral blood was drawn from healthy study participants after an overnight fast and again six hours after a meal.

After blood sampling, both metabolic activity (including glucose uptake, lipid accumulation, and mitochondrial function) and cytokine production (including interferon gamma (IFN-γ) and tumor necrosis factor (TNF)) were measured in CD3+ T cells isolated from participants’ blood samples. In parallel, mouse models were used to validate the findings. Mice were either fasted or fed, and CD8-positive T cells were isolated for metabolic and functional analysis.

The researchers performed adoptive transfer experiments using a transgenic T cell receptor specific for ovalbumin (THAT) T cells for assessment in vivo immune responses following infection with modified Ankara vaccinia virus encoding ovalbumin (VV-OVA).

Serum transfer, lipid catheterization, and chylomicron isolation experiments were used to assess the effects of driver nutrients on changes in the immune response. Molecular analyzes included ribonucleic acid sequencing (RNAseq), transposase-accessible chromatin sequencing assay (ATAC-sequence), and proteomics.

Mechanistic studies also included evaluation of the regulation and translation of the mammalian target of rapamycin complex 1 (mTORC1) using pharmacological inhibitors such as rapamycin.

Postprandial metabolic and immunological effects

T cells collected after eating a meal had greater metabolic activity than T cells collected during fasting. In addition, they showed significantly increased glucose uptake, increased intracellular lipid levels, and increased mitochondrial mass, suggesting enhanced energy capacity.

Using functional assays, the researchers showed that T cells collected after eating produced significantly higher amounts of IFN-γ and TNFtwo key cytokines involved in immune protection. Importantly, these benefits were also observed in T cells after activation and expansion, suggesting ongoing metabolic reprogramming.

Data from mouse studies have shown this CD8+ T cells exhibited increased metabolic activity, including enhanced oxidative metabolism, glycolytic capacity, and proliferation, in fed mice compared with those in the fasted state.

In an infection model, T cells from fed conditions proliferated more aggressively and elicited stronger immune responses than T cells from fasted conditions, even when transferred into the same host. These effects were evident even when the cells were transferred into the same host, indicating intrinsic cellular changes rather than environmental influences.

Chylomicrons, lipid metabolism and mTORC1 signaling

Further investigation revealed that lipid metabolism was the main contributor to this enhancement. Serum from fed subjects increased T cell metabolism in fasting T cells, whereas fasting serum did not. Specific experiments using diets based on nutrient types showed that a diet rich in lipids, rather than a diet rich in carbohydrates or proteins, more strongly reproduced these changes.

In addition, triglyceride-rich chylomicrons (lipid transport particles formed after a meal) were identified as mediators of this process, as they are responsible for providing lipid components to the T lymphocyte and enhancing both mitochondrial function and energy production.

Proteomic analysis revealed higher levels of proteins involved in processes such as translation, metabolism and cellular activation. Increased translation was confirmed using puromycin incorporation assays, indicating that postprandial T cells were primed for a rapid response upon activation.

Analysis of both gene expression and chromatin accessibility between the fasted and fed conditions showed only minor differences, suggesting that any changes were primarily post-transcriptional processes rather than broad transcriptional or chromatin accessibility changes. Therefore, these changes in cellular functions were a direct result of rapid nutrient-driven reprogramming through signaling pathways.

Effects of Nutrition on Immunotherapy Performance

The study translated the clinical relevance into therapeutic application models. For example, tumors were better controlled using T-lymphocytes collected from fed animals (in melanoma models). In addition, the human chimeric T antigen receptor (TROLLEY) cells generated after feeding showed higher metabolic activity, greater cytotoxicity and greater persistence when evaluated in murine models of leukemia. Taken together, the findings suggest that short-term nutritional status at the time of T cell collection or activation may influence the performance of immune-based therapies.

This study suggests that the postprandial nutritional state prior to T cell activation can enhance T cell function in experimental systems by enhancing metabolism, protein synthesis, and long-term immune performance. Lipid-rich chylomicrons produced after meals play a central role in activation mTORC1 signaling and increasing translational capacity. These effects persist beyond the immediate postprandial period and may influence how T cells respond during infection, vaccination, and cancer immunotherapy, although immediate clinical testing is still needed.

The results, therefore, indicate that understanding nutritional status, and not just time of day, can influence immune system regulation. Accounting for nutritional status may be important in future studies of immune monitoring and cell therapy design.

However, the authors also noted that although postprandial conditions supported greater T cell expansion and memory formation, equal numbers of memory T cells generated by fasted and fed conditions did not necessarily differ upon re-challenge.

How food boosts your immune system: by revitalizing metabolism and T cell function, the adage “you feed a cold” is true! https://t.co/KYoWyokiAs
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– Eric Topol (@EricTopol) April 29, 2026