Research perspective · 11 September 2026
Immune capacity involves more than ATP
A dendritic-cell study refines the proposed Proportional Danger Theory.
The proposed link
Proportional Danger Theory asks how physiological capacity interacts with danger signals to shape an immune response. The useful research question concerns appropriate activation and resolution, not simply a larger response. The term proportional remains a hypothesis, not a validated equation.
What the new study changes
Heras-Murillo and colleagues found that disrupting mitochondrial complex III altered dendritic-cell responsiveness through metabolic and epigenetic regulation without a matching reduction in ATP [1]. The response differed by cell subtype. This is evidence that mitochondrial state can influence immune behaviour through mechanisms beyond bulk energy supply.
For EPK, that distinction matters. Calories per kilogram cannot be assumed to measure the relevant redox or regulatory capacity. The experiment supports a cellular mechanism; it does not establish a dietary exposure-to-immunity pathway.
Separate the links
A study would first need to show whether the defined EPK exposure relates to the relevant immune-cell phenotype. It would then need to connect that phenotype to a later immune outcome. Measuring all variables at one visit cannot establish the required sequence or exclude a shared cause.
Age, infection, medication, prior antigen exposure, sleep and disease can affect the response. Analyses should identify the immune-cell subtype and functional assay rather than treating all immune activity as a single endpoint.
A concrete test
One design could measure baseline intake, mass and body composition before a routine vaccine, with a prespecified response endpoint and follow-up interval. A mechanistic subset could examine cell respiration and redox state. The protocol would need to distinguish response magnitude from excessive inflammation and successful resolution.
Compare the ratio with flexible models of energy intake and mass, and report uncertainty and external validation. If mitochondrial state predicts response but EPK does not, the cellular finding remains valuable while the proposed EPK link is weakened.
The study therefore makes the theory more specific and more falsifiable. It offers no basis for claiming that more calories or sugar generally boosts immunity.
Research and guidance
Explore more studies in the research library.
Related working papers
Read the relevant PDFs: EPK–001 to 007 are the revised version 1.2 papers; EPK–008 to 010 are version 1.0 supplements. Earlier PDFs and DOI records remain on the paper archive.