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the claim
Working out in a fasted state causes weight gain.
the verdict
INSUFFICIENT LEANING
Recorded sources
0 sources for · 3 against
Is it true that working out in a fasted state causes weight gain?
Unclear. The retrieved items do not directly test whether fasted exercise causes weight gain. One National Geographic article on fasted workouts says the long-term picture is unclear, and a 2025 BMJ network meta-analysis of intermittent fasting found fasting strategies reduced body weight rather than increased it, but neither addresses fasted exercise causing weight gain.
Verdict: PARTIAL LEAN · 0 sources for, 3 against · Last checked
Evidence against · 3
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Weight gain. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Weight_gain
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More against · 2
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Semnani-Azad, Z., Khan, T. A., Chiavaroli, L., Chen, V., Bhatt, H. A., Chen, A., Chiang, N., Oguntala, J., Kabisch, S., Lau, D. C., Wharton, S., Sharma, A. M., Harris, L., Leiter, L. A., Hill, J. O., Hu, F. B., Lean, M. E., Kahleová, H., Rahelic, D., & Salas-Salvadó, J. (2025). Intermittent fasting strategies and their effects on body weight and other cardiometabolic risk factors: systematic review and network meta-analysis of randomised clinical trials.. doi.org. https://doi.org/10.1136/bmj-2024-082007
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What happens to your body when you work out before you eat | National Geographic. (n.d.). nationalgeographic.com. https://www.nationalgeographic.com/health/article/fasting-exercise-health-benefits
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