Ketone bodies mimic the life span extending properties of caloric restriction.
Level 5 - mechanism / opinion, no new human data
Narrative review and mechanistic hypothesis paper without new human empirical data
PubMed 28371201 · doi:10.1002/iub.1627
What was done
This is a narrative review and theoretical hypothesis synthesizing molecular pathways across model organisms (including yeast, Caenorhabditis elegans, rodents, and primates). The authors evaluated how ketosis, induced physiologically or through exogenous ketone bodies, influences insulin/IGF-1 signaling, histone deacetylase activity, mitochondrial function, and antioxidant defenses.
What was found
The abstract describes biochemical pathways and model organism findings without quantitative values: - Caloric restriction and ketosis decrease insulin/insulin-like growth factor receptor signaling (IIS), reducing PI3K and AKT kinase activity and decreasing FOXO phosphorylation, which promotes nuclear localization of FOXO transcription factors. - Nuclear FOXO enhances the transcription of antioxidant enzymes, such as superoxide dismutase 2, catalase, and glutathione peroxidase. - The ketone body d-beta-hydroxybutyrate acts as an inhibitor of class I and IIa histone deacetylases that repress FOXO3a transcription, and shifts the NADP antioxidant system to a more negative redox potential. - Addition of d-beta-hydroxybutyrate extends lifespan in C. elegans cultures. No quantitative effect sizes, sample sizes, or human empirical measurements are provided in the abstract.
Why it matters
This review proposes a mechanistic framework positioning ketone bodies and ketone esters as potential caloric restriction mimetics that target aging biology without dietary deprivation.
Limits
The claims rely entirely on theoretical extrapolation, biochemical models, and non-human organismal data (such as C. elegans). No human lifespan, healthspan, or clinical interventional data are presented.
Cited by
- supports Ketone bodies generate less oxidative stress and require less energy to produce cellular energy compared to glucose.