Narrative review: intermittent fasting and oxidative stress across animal and human evidence
This narrative review reports that intermittent fasting activates nutrient-sensing pathways and reduces oxidative damage in preclinical models, while human studies show only modest, non-specific biomarker changes and clinical significance remains uncertain. [1]
Automatic summary · not editorially reviewed
The key findings
The review describes IF as inducing a metabolic switch that activates AMPK, SIRT1 and NRF2 pathways and autophagy. [1]
Preclinical studies consistently show reduced oxidative damage, but translation to humans remains uncertain. [1]
Human studies report modest changes in non-specific markers such as MDA and F₂-isoprostanes, and long-term trials are lacking. [1]
The source at a glance
- Study type / format
- Narrative review (abstract)
- Population / context
- Preclinical models and human participants in Ramadan cohorts and small interventional trials, as summarized in the review
- Summary based on
- Study abstract
- Original publication
- June 30, 2026
Review scope: fasting effects on oxidative pathways
The review asks how intermittent fasting (IF) may influence oxidative stress at molecular, cellular and clinical levels. It describes a metabolic switch from glucose to fatty acid and ketone use, activating nutrient-sensing pathways such as AMPK, SIRT1 and NRF2, plus autophagy. The authors link these to better mitochondrial function, stronger antioxidant defenses and less reactive oxygen species production. This is a narrative synthesis, not a new experiment.
Supporting source [1]
Animal models show reduced oxidative damage
Preclinical studies consistently report that IF can reduce oxidative damage, upregulate the body's own antioxidant systems and improve cellular stress resilience. The review stresses that much of this mechanistic evidence comes from animal and experimental models, and that direct translation to humans remains uncertain.
Supporting source [1]
Human biomarker changes are modest and non-specific
Human studies, including Ramadan cohorts and small interventional trials, report modest changes in commonly used oxidative stress markers such as malondialdehyde (MDA) and F₂-isoprostanes. The review notes these markers are non-specific, vary with methods and do not fully reflect tissue-level redox dynamics or clinically meaningful outcomes. Human evidence remains limited, heterogeneous and largely short-term, with no long-term randomized controlled trials on clinically relevant endpoints.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. This is a narrative review, so no systematic search or pooled analysis is described. Much mechanistic evidence comes from animal and experimental models, human studies are short-term and heterogeneous, and no long-term randomized controlled trials on clinically relevant endpoints are reported.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Raja PAL, Gunadi JW, Sanjaya A. · europepmc.org · June 30, 2026