Eating More Creatine Linked to Lower Epigenetic Mortality Risk After 50

Creatine is best known as a sports supplement, but it is also a conditionally essential nutrient found naturally in meat and dairy. As people age, both endogenous creatine synthesis and dietary intake tend to decline, potentially accelerating biological aging. This study is the first to ask whether habitual creatine consumption is reflected in epigenetic biomarkers that predict mortality risk—a question with direct implications for dietary guidance in older adults.

The researchers drew on two NHANES cycles (1999–2000 and 2001–2002), which uniquely include whole-blood DNA methylation profiles measured on the Illumina EPIC array alongside detailed dietary recall data. The final sample comprised 4,983 participants aged 50 and older (mean age 67.6 years; 51.2% female). Daily creatine intake was estimated from 24-hour dietary recalls using established creatine content values for meat (3.88 g/kg) and milk-based foods (0.20 g/kg), excluding supplement use. The primary outcomes were GrimAgeMort and GrimAge2Mort—DNAm-based scores that integrate methylation surrogates for smoking history, plasma proteins, sex, and chronological age to estimate biological age and mortality risk.

Mean dietary creatine intake was 0.77 g/day. Significant inverse correlations were observed between creatine intake and both GrimAgeMort (r = −0.041, p = 0.045) and GrimAge2Mort (r = −0.047, p = 0.019). In crude linear regression, each additional gram of daily creatine was associated with a 1.00-point decrease in GrimAgeMort and a 1.08-point decrease in GrimAge2Mort. After adjusting for sex, race/ethnicity, education, and income, these estimates increased to −1.29 and −1.32 points respectively (both p < 0.001). Further adjustment for dietary covariates yielded coefficients of −1.12 and −1.17 (both p = 0.001). A zero-inflated modeling approach confirmed that the small proportion of non-consumers (3.1%) did not distort results.

The authors propose several biological mechanisms: creatine's role in ATP regeneration may protect against cellular stress; its anti-inflammatory and antioxidant properties may counter accelerated epigenetic aging; muscle-preserving effects reduce sarcopenia-related mortality risk; neuroprotective benefits may lower neurodegeneration-linked aging signals; and creatine's ability to spare S-adenosylmethionine may directly stabilize DNA methylation patterns. Higher creatine intake also correlates with broader animal-protein dietary patterns rich in B12, iron, and zinc—nutrients independently associated with healthy aging.

Important caveats temper these findings. The cross-sectional design prevents causal inference. A single 24-hour recall is a noisy proxy for habitual intake. Supplement-derived creatine was excluded, potentially underestimating total exposure. Residual confounding from unmeasured lifestyle or genetic factors cannot be ruled out. GrimAgeMort and GrimAge2Mort are predictors of mortality, not observed mortality endpoints, and GrimAge acceleration was not analyzed as a separate outcome. Generalizability beyond the 1999–2002 US population is uncertain.