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Updated: Oct 5, 2025
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Assessment of the Metabolic Effects of Isocaloric 2:1 Intermittent Fasting in Mice
Published on: November 27, 2019
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Intermittent fasting: eating by the clock for health and exercise performance
Sumona Mandal1, Niall Simmons1, Sidra Awan2
1University College London, Medical School, London, UK.
BMJ Open Sport & Exercise Medicine
|January 24, 2022
Summary
Intermittent fasting (IF) offers health benefits beyond weight loss, including improved metabolic health and reduced inflammation. For athletes, IF presents opportunities to optimize training adaptations while respecting personal fasting practices.
Area of Science:
- Nutrition Science
- Exercise Physiology
- Metabolic Health
Background:
- Intermittent fasting (IF) is a dietary practice with historical roots in various traditions.
- Emerging research suggests IF benefits extend beyond calorie restriction, impacting metabolic health.
- IF may reduce systemic inflammation and play a role in chronic disease management.
Purpose of the Study:
- To explore the physiological effects of intermittent fasting, particularly in the context of exercise.
- To examine the potential of IF protocols for athletes seeking to maintain performance during fasted states.
- To highlight future research directions for understanding and implementing IF in active populations.
Main Methods:
- Review of current scientific literature on intermittent fasting and its physiological impacts.
- Analysis of metabolic shifts, circadian clock optimization, and inflammatory markers associated with IF.
- Discussion of IF's implications for athletic performance and training adaptations.
Main Results:
- IF influences metabolic shifts in energy production and optimizes peripheral circadian clocks.
- Evidence suggests IF can improve physiological markers of metabolic health and reduce inflammation.
- Fasted exercise protocols may offer athletes a novel approach to training and performance.
Conclusions:
- Intermittent fasting demonstrates significant potential for enhancing metabolic health and reducing inflammation.
- IF protocols may provide athletes with a method to optimize training adaptations while adhering to personal fasting preferences.
- Further research is needed to fully elucidate the benefits and practical applications of IF for athletes and the general active population.
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