Low-carb diets enhance athletic and mental performance
While low-carbohydrate and ketogenic diets successfully increase fat oxidation and aid in weight management, robust scientific evidence demonstrates that they do not enhance athletic performance and frequently impair high-intensity or endurance output.
The claim posits that low-carb diets enhance both athletic and mental performance. While a few papers note metabolic adaptations like increased fat oxidation (e.g., Paper [3]) or minor cognitive associations in older adults (Paper [8]), rigorous experimental studies and systematic reviews on athletes consistently show that low-carb/ketogenic diets fail to improve athletic performance and often impair high-intensity exercise economy and endurance (Papers [1], [6], [9], [11]). Therefore, the claim is refuted regarding athletic enhancement, and lacks consistent backing for mental performance enhancement.
Jeff S. Volek, Daniel J. Freidenreich, Catherine Sáenz, Laura J. Kunces, Brent C. Creighton, Jenna M. Bartley, Patrick M. Davitt, Colleen X. Muñoz, Jeffrey M. Anderson, Carl M. Maresh, Elaine C. Lee, Mark D. Schuenke, Giselle Aerni, William J. Kraemer, Stephen D. Phinney. Metabolic characteristics of keto-adapted ultra-endurance runners. 2015. https://doi.org/10.1016/j.metabol.2015.10.028
Long-term keto-adaptation in ultra-endurance runners results in extraordinarily high rates of fat oxidation while maintaining similar muscle glycogen utilization.
Louise M. Burke, Megan L. Ross, Laura A. Garvican‐Lewis, Marijke Welvaert, Ida A. Heikura, Sara G. Forbes, Joanne G. Mirtschin, Louise E. Cato, Nicki Strobel, Avish P. Sharma, John A. Hawley. Low carbohydrate, high fat diet impairs exercise economy and negates the performance benefit from intensified training in elite race walkers. 2016. https://doi.org/10.1113/jp273230
Adaptation to a ketogenic low-carbohydrate, high-fat diet impairs performance in elite endurance athletes due to reduced exercise economy.
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Caryn Zinn, Matthew R. Wood, Mikki Williden, Simon Chatterton, Ed Maunder. Ketogenic diet benefits body composition and well-being but not performance in a pilot case study of New Zealand endurance athletes. 2017. https://doi.org/10.1186/s12970-017-0180-0
Endurance athletes undertaking a 10-week ketogenic diet experienced significant performance decrements, such as reduced time to exhaustion and inability to easily undertake high-intensity bouts.
Adrián Moreno-Villanueva, Markel Rico-González, José Pino-Ortega. The Effects of a Ketogenic Diet on Anthropometric Parameters, Metabolic Adaptation, and Physical Fitness Performance in Amateur Endurance Athletes: A Systematic Review. 2021. https://doi.org/10.1519/ssc.0000000000000647
A systematic review concluded that although ketogenic diets can induce anthropometric and metabolic changes, they do not improve amateur endurance athletes' performance.
Kacper Bartosik, Dawid Furtek, Klaudia Ostrowicz, Kinga Kurenda. The Impact of the Ketogenic Diet on Athletic Performance: A Systematic Literature Review. 2025. https://doi.org/10.12775/qs.2025.43.62344
Recent literature indicates that while the ketogenic diet may promote weight loss, it does not consistently improve aerobic capacity, strength, or speed, and can lead to performance declines.
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