12-day supervised fasting: epigenetic aging clocks in 32 adults
In 32 participants, a 12-day medically supervised fast produced coordinated metabolic and blood changes, partly persisting at one month, plus modest DNA methylation changes and clock-specific epigenetic aging responses. Lower baseline epigenetic age acceleration was linked to greater fasting-induced weight loss. [1]
Automatic summary · not editorially reviewed
The key findings
The study examined physiological and epigenetic responses to a 12-day medically supervised fasting intervention with longitudinal follow-up in 32 participants. [1]
Fasting caused coordinated systemic physiological changes across metabolic and hematological parameters, partly persisting at one month. [1]
Lower baseline epigenetic age acceleration was consistently associated with greater fasting-induced weight loss. [1]
The source at a glance
- Study type / format
- Longitudinal intervention study (abstract only)
- Population / context
- 32 participants in a medically supervised fasting study
- Summary based on
- Study abstract
- Publication status
- Preprint · peer-review status not confirmed
- Original publication
- June 17, 2026
Fasting study in 32 adults with one-month follow-up
The abstract describes a longitudinal study of a 12-day medically supervised fasting intervention in 32 participants, with follow-up. The authors asked whether this time-limited but intensive intervention engages molecular processes related to biological aging in humans, since prolonged fasting is known to cause marked metabolic adaptations. Physiological and epigenetic responses were examined together. The abstract does not report participant characteristics, how fasting was defined, or the exact follow-up schedule beyond one month.
Supporting source [1]
Metabolic shifts and modest methylation changes after fasting
Fasting produced coordinated systemic physiological changes across metabolic and hematological parameters, with partial persistence at one month. Genome-wide DNA methylation analyses showed modest but detectable changes at individual CpG sites, which emerged primarily at follow-up and were spread across genomic contexts. Epigenetic aging clocks responded in a clock-specific and time-dependent way, with substantial differences between individuals. The abstract does not state the direction or size of these clock changes, so they should not be read as proven rejuvenation.
Supporting source [1]
Baseline epigenetic age and weight loss link
Lower baseline epigenetic age acceleration was consistently associated with greater fasting-induced weight loss. This is an association between a measurement taken before the intervention and a later outcome, not evidence that fasting causes epigenetic rejuvenation or that epigenetic state causes weight loss. The authors present epigenetic clocks as integrative molecular readouts for studying aging-related responses to short-term metabolic interventions, while noting current interpretive limits. The abstract does not report effect sizes, statistical details or long-term health outcomes.
Supporting source [1]
How to interpret this
This explainer is based only on the abstract; the full text was not reviewed. The abstract reports no effect sizes, participant characteristics, fasting protocol details or long-term outcomes, and the weight-loss link is an association, not causation.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Luo S, Knufinke M, Kinnaer C, Chapatte L, Nusslé S, Nusslé SG, Grundler F, Wilhelmi de Toledo F, Horvath S, Mesnage R, von Meyenn F. · europepmc.org · June 17, 2026