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Review of intermittent fasting and time-restricted eating effects on stress biology and mental healthIntermittent fasting and time restricted eating show mixed results for stress and mental health

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Key Takeaway
Consider balancing potential benefits against risks when considering IF interventions for stress resilience and mental health.

This narrative review evaluates the effects of intermittent fasting and time-restricted eating on stress biology and mental health. The scope covers a range of experimental models and human studies without a single defined population or setting. The authors highlight that reported effects frequently vary depending on study design, experimental model, phenotype, and fasting protocol. In some cases, the findings are contradictory rather than consistent across the literature.

The review does not report specific effect sizes, absolute numbers, p-values, or confidence intervals for primary or secondary outcomes. Safety data, including adverse events, serious adverse events, discontinuations, and tolerability, are not reported in this synthesis. The authors acknowledge that the lack of standardized reporting limits the ability to draw firm conclusions about efficacy or harm.

Practice relevance is addressed by emphasizing the need to carefully balance potential benefits against risks when considering IF interventions for stress resilience and mental health maintenance. Clinicians should interpret these findings with caution given the heterogeneity and potential contradictions in the underlying data. No definitive causal claims are made due to the observational nature of much of the included evidence.

This review looks at how intermittent fasting and time-restricted eating affect stress biology and mental health. The goal was to see if these eating patterns help people manage stress better. However, the findings are not clear or consistent across different research projects.

Many studies report different and sometimes opposite effects on the body and mind. Some people might feel better, while others might feel worse. The results depend heavily on the specific rules of the fasting plan, the length of time spent fasting, and the type of study design used.

Because the results are so different, it is hard to say for sure if these methods work for everyone. Scientists say that the effects change based on the person's health, the specific protocol used, and how the study was set up. This makes it difficult to give one simple answer about whether these diets are good for stress.

Healthcare providers need to be careful when suggesting these diets. It is important to weigh the possible good results against the risks for each individual. More research is needed to understand exactly how these eating patterns affect stress and mental well-being before making strong recommendations.

What this means for you:
Results for stress and mental health vary widely based on the specific fasting method and study design used.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedMay 2026
View Original Abstract ↓
Intermittent fasting (IF) and time-restricted eating (TRE) are recognized as metabolic interventions that link energy balance regulation with influence on stress-related physiological and neuroendocrine processes. Accumulating evidence suggests that IF acts as a mild, controllable stressor that triggers adaptive cellular and systemic responses. Central mechanisms that are involved in these effects are nutrient-sensing pathways, including AMP-activated protein kinase, sirtuins, the target of rapamycin (TOR), and insulin signaling pathways, which collectively coordinate metabolic flexibility and stress adaptation. IF has been shown to modulate hypothalamic–pituitary–adrenal (HPA) axis activity and promote redox and inflammatory homeostasis. This review discusses both preclinical and clinical studies examining the effects of IF and TRE on stress biology and mental health, which frequently report heterogeneous and, in some cases, contradicting effects. Reported effects may vary depending on study design, experimental model, phenotype, and fasting protocol. By integrating data from experimental research, this review highlights the bidirectional interaction between nutritional timing and stress biology and emphasizes that hormesis is a potential mechanism underlying stress resilience. This review also emphasizes the need to carefully balance potential benefits against risks when considering IF interventions for stress resilience and mental health maintenance.
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