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Docteur IZA@docteur_izaInstagram

Comment bien gérer ses courses à jeun ? A l’aube du Ramadan 2025, @docteur_iza nous raconte les difficultés

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what it claims

To maintain athletic performance during Ramadan, it is necessary to strategically adapt one's training and nutrition around fasting periods.

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Practicing sports while fasting is a widely documented subject in sports science literature.

noli's read

Practicing sports while fasting is a widely documented subject in sports science literature. Meta-analyses (notably published in 'Sports Medicine') confirm that while fasting can induce increased fatigue and a decrease in maximal intensity, adaptation is possible. It is scientifically recognized that adjusting the volume and scheduling of sessions (favoring times close to breaking the fast or early in the morning if the intensity is low) helps limit muscle catabolism. The idea that nutrition must be optimized during eating windows (rehydration and protein intake) is supported by observational studies on athletes observing Ramadan. Conversely, the risk of dehydration is often underestimated and constitutes the primary limiting factor, more so than the lack of energy itself. The advice is therefore solid, although each individual must test their own metabolic tolerance, as scientific evidence highlights significant interindividual variability.

the sources

  1. 1Hackett D, Hagstrom AD 2017
  2. 2Vieira AF, Costa RR, Macedo RCO, Coconcelli L, Kruel LFM 2016

Claimed by Docteur IZA. Noli grades the claim, never the person.

Decoded by Noli · July 18, 2026 · the original post

What the graded evidence says

Evidence
B
Effect
body composition (fasted vs fed exercise) and in-session fat oxidation — trivial between-group effect on body mass/composition (5 studies, n=96); fat oxidation during exercise higher fasted (WMD ~3.1 g), an acute effect that doesn't translate to greater fat loss
Measured on
healthy adults; body-composition data limited and skewed to women

What’s uncertain

The body-composition evidence base is small. Burning more fat during a fasted session doesn't mean more fat lost over time. The 'women should never train fasted' claim lacks strong supporting evidence, though some people simply feel better training fed.

Docteur IZA in the Register35 claims graded · solidity 84/100See their record →

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