Breaking Down RED-S, Low Energy Availability, Fasted Training & Recovery for Body Composition - with Dr Tony Boutagy

Breaking Down RED-S, Low Energy Availability, Fasted Training & Recovery for Body Composition - with Dr Tony Boutagy

🌐 Visit → tonyboutagy.com

📲 Follow us on Instagram → @tonyboutagy


The fitness industry prescribes energy deficits without the framework to know when a deficit becomes harmful. This episode translates the RED-S research into practical application for coaches and individuals working on body composition.


In this episode we breakdown the key concepts from recent conversation with Professor Louise Burke.


You'll learn:

  • Low energy availability (the exposure) vs RED-S (the syndrome) - why the distinction matters for application

  • Why fat-free mass, not total body mass, is the correct denominator for energy availability

  • The threshold numbers: ~20 cal/kg FFM for fat loss; below 15 cal/kg FFM where adverse consequences are well-documented

  • Which systems are affected first - reproductive hormones and bone turnover - and how quickly (research shows within five days at 10 cal/kg FFM, which the transcript notes is not uncommon in physique sport)

  • Why metabolic adaptation is a consequence of RED-S, not a separate phenomenon

  • What the evidence does and doesn't support on sex differences in fasted exercise, including the kisspeptin hypothesis

  • Why fasted training and low energy availability are not the same thing

  • The 2023 RED-S questionnaire toolkit

  • Prevention: returning to energy balance (30–40 cal/kg FFM) one to two days per week

  • Recovery: stepwise calorie increase and gastrointestinal adaptation

Key insight: Low energy availability is the exposure; RED-S is the syndrome.

Fasted training is not the same as low energy availability.

These distinctions are foundational to applying this research correctly.


Topics: RED-S, low energy availability, fat-free mass, metabolic adaptation, fasted training, kisspeptin, body composition, physique sport, Louise Burke, Stronger With Time


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