Figure 644 healthy volunteers conducted a three week KD with a limited carbohydrate consumption of <30g per day. Blood was taken and analyzed prior to starting the diet (T0) and again after three weeks of strict adherence to the diet (T1). PBMCs were isolated. T cell stimulation was performed through CD3/CD28 Dynabeads at a bead:cell ratio of 1:8. Pan/CD4+/CD8+ T cells were separated via magnetic cell labeling. Mitochondrial metabolism was analyzed for each subpopulation using a Seahorse XF96 Analyzer. (A, B) OCR, maximum respiration, spare respiratory capacity and basal respiration were measured in A CD4+ and B CD8+ T cells, n=14 individual experiments, each performed in three technical replicates. Data information: Data depicted as mean ± SEM (OCR) or as box plots with median, twenty-fifth and seventy-fifth percentiles and range , crosses indicating mean Dots indicating individual values. *p<0.05, **p<0.01, paired t-test/ Wilcoxon matched-pairs signed rank test, as appropriate.44 healthy volunteers conducted a three week KD with a limited carbohydrate consumption of <30g per day. Blood was taken and analyzed prior to starting the diet (T0) and again after three weeks of strict adherence to the diet (T1). PBMCs were isolated. T cell stimulation was performed through CD3/CD28 Dynabeads at a bead:cell ratio of 1:8. Pan/CD4+/CD8+ T cells were separated via magnetic cell labeling. Mitochondrial metabolism was analyzed for each subpopulation using a Seahorse XF96 Analyzer. E Western Blot of mitochondrial oxidative phosphorylation proteins in CD4+/CD8+ T cells as indicated, representative of five individual experiments.44 healthy volunteers conducted a three week KD with a limited carbohydrate consumption of <30g per day. Blood was taken and analyzed prior to starting the diet (T0) and again after three weeks of strict adherence to the diet (T1). PBMCs were isolated. T cell stimulation was performed through CD3/CD28 Dynabeads at a bead:cell ratio of 1:8. Pan/CD4+/CD8+ T cells were separated via magnetic cell labeling. Mitochondrial metabolism was analyzed for each subpopulation using a Seahorse XF96 Analyzer. F Confocal microscopy images of human CD4+/CD8+ T cells, stained with MitoTracker green, representative of two individual experiments.44 healthy volunteers conducted a three week KD with a limited carbohydrate consumption of <30g per day. Blood was taken and analyzed prior to starting the diet (T0) and again after three weeks of strict adherence to the diet (T1). PBMCs were isolated. T cell stimulation was performed through CD3/CD28 Dynabeads at a bead:cell ratio of 1:8. Pan/CD4+/CD8+ T cells were separated via magnetic cell labeling. Mitochondrial metabolism was analyzed for each subpopulation using a Seahorse XF96 Analyzer. H TruCulture IFNγ, IL4, IL6, IL8, IL12 subunit p40, IL23 and TNFα protein quantification of LPS-stimulated whole blood samples, n=11/12/11/10/11/10/11 individual human subjects. Data information: Data depicted as mean ± SEM (OCR) or as box plots with median, twenty-fifth and seventy-fifth percentiles and range Dots indicating individual values. *p<0.05, **p<0.01, paired t-test/ Wilcoxon matched-pairs signed rank test, as appropriate.