New research reveals how lipids released after meals can sustainably boost the metabolic, translational and immune capabilities of T cells, with implications for infectious disease research and next-generation cell therapies.
Research: Postprandial lipid metabolism permanently enhances 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 your body’s effective response to infection? The immune system relies on energy and can be affected by small metabolic changes. T cells require considerable energy to activate, multiply, and kill pathogens and abnormal cells.
Although much research has been conducted over months and years on long-term dietary patterns and nutrition, the short-term effects of food intake on the immune system (postprandial effects) are not well understood. This gap is important because available nutrients are constantly fluctuating due to daily dietary cycles.
Understanding these rapid metabolic changes may aid future research in vaccination, infectious disease responses, and immunotherapy. Further research is needed to clarify how short-term nutrition affects immune cell function.
Fasted and fed T cell study design
In this study, we analyzed both human and mouse immune responses under fasting and postprandial conditions. Peripheral blood was collected from healthy study participants after an overnight fast and again 6 hours after a meal.
After blood samples were collected, we measured both metabolic activity (including glucose uptake, lipid accumulation, and mitochondrial function) and cytokine production (including interferon gamma (IFN-γ) and tumor necrosis factor (TNF)) of CD3+ T cells isolated from participants’ blood samples. In parallel, we validated our findings using a mouse model. Mice were fasted or fed, and CD8+ T cells were isolated for metabolic and functional analyses.
Researchers conducted adoptive transfer experiments using ovalbumin-specific T-cell receptor transgenic (OT-I) T cells to assess in vivo immune responses following infection with modified vaccinia virus Ankara (VV-OVA) encoding ovalbumin.
Serum transfer, lipid gavage, and chylomicron isolation experiments were used to assess the influence of nutrient drivers on altered immune responses. Molecular analyzes include ribonucleic acid sequencing (RNAseq), assays for transposase-accessible chromatin sequencing (ATAC-seq), and proteomics.
Mechanistic studies also include evaluation of the regulation and translation of mammalian target of rapamycin complex 1 (mTORC1) using pharmacological inhibitors such as rapamycin.
Effects on postprandial metabolism and immunity
T cells collected after a meal were more metabolically active than T cells collected during a fast. Additionally, they exhibited 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 harvested after a meal produced significantly higher amounts of IFN-γ and TNF, two important cytokines involved in immune defense. Most importantly, these benefits were also observed in T cells after activation and expansion, suggesting that metabolic reprogramming is sustained.
Data from mouse studies demonstrated that CD8+ T cells exhibit increased metabolic activities, including enhanced oxidative metabolism, glycolytic capacity, and proliferation, in fed mice compared to mice in a fasted state.
In infection models, T cells under fed conditions proliferated more aggressively and elicited stronger immune responses than T cells under fasted conditions, even when transferred to the same host. These effects are evident even when the cells are transferred into the same host, indicating changes in the cell’s intrinsic properties rather than environmental effects.
Chylomicrons, lipid metabolism, and mTORC1 signaling
Further investigation revealed that lipid metabolism primarily contributed to this enhancement. Serum from fed individuals, but not fasting serum, increased T cell metabolism in fasted T cells. Specific experiments using diets based on nutrient type demonstrated that diets rich in lipids most strongly reproduced these changes, rather than diets rich in carbohydrates or proteins.
Additionally, triglyceride-rich chylomicrons (lipid transport particles formed after meals) were identified as mediators of this process, as they are responsible for delivering lipid components to T lymphocytes and enhancing both mitochondrial function and energy production.
Proteomic analysis revealed high levels of proteins involved in processes such as translation, metabolism, and cell activation. Increased translation was confirmed using a puromycin uptake assay and showed that postprandial T cells are primed for a rapid response upon activation.
Analysis of both gene expression and chromatin accessibility between fasted and fed states showed only minor differences, suggesting that any changes are primarily due to post-transcriptional processes rather than widespread transcription or chromatin accessibility changes. Therefore, these changes in cellular function were a direct result of rapid reprogramming by nutrients through signaling pathways.
Impact of nutrition on immunotherapy performance
This study translated clinical relevance into a therapeutic application model. For example, using T cells taken from fed animals (melanoma model) resulted in better tumor control. Furthermore, human chimeric antigen receptor T (CAR-T) cells generated after feeding exhibited higher metabolic activity, higher cytotoxicity, and longer persistence when evaluated in a murine leukemia model. Overall, this finding suggests that short-term nutritional status during T cell collection or activation may influence the performance of immune-based therapies.
This study suggests that postprandial nutritional status prior to T cell activation can enhance T cell function in experimental systems by promoting metabolism, protein synthesis, and long-term immune performance. Lipid-rich chylomicrons produced after meals play a central role by activating 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 direct clinical trials are still needed.
Therefore, this result suggests that understanding nutritional status, and not just time of day, can influence immune system regulation. Considering nutritional status may be important in future studies on immune monitoring and cell therapy manufacturing.
However, the authors also noted that although postprandial conditions support greater T cell proliferation and memory formation, similar numbers of memory T cells generated under fasted and fed conditions do not necessarily differ upon rechallenge.
How eating strengthens your immune system: Activate T-cell metabolism and function There’s a basis for the adage “cold-catching.” https://t.co/KYoWyokiAs
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Reference magazines:
- Kumar, A., Rivadeneira, DB., Mehta, I., Hsieh, B., Cumberland, R., Joshi, SK., Kanshana, J.S., Gunn, W.G., Dean, V., Parris, A., Mulder, K., Myers, ES., Mallett, S.J., Catley, RT., Gelhaus, SL., Overacre-Delgoffe, AE., Das, J., Hose, WF., Cohan, AB., and D.Delgoffe, GM. (2026). Postprandial lipid metabolism permanently strengthens T cell immunity. Nature. Doi: 10.1038/s41586-026-10432-8 https://www.nature.com/articles/s41586-026-10432-8
