- Aug 14, 2018
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One of the most common reasons women stall in the gym isn't training — it's fuel. Sports medicine has a name for the pattern: Relative Energy Deficiency in Sport, or RED-S, described in the International Olympic Committee's consensus statements (updated in 2023 under lead author Margo Mountjoy). It happens when the energy left over after training is too low to run the body's normal systems — and in women it often arrives quietly, disguised as "being disciplined."
The physiology underneath is energy availability: calories eaten minus exercise expenditure, relative to lean body mass. Classic work by Anne Loucks and colleagues showed that when energy availability drops below a threshold, reproductive hormones are disrupted within days — the body triages fertility as non-essential. The IOC consensus expanded the picture beyond the old "female athlete triad": suppressed metabolism, impaired immunity, poor bone formation, cardiovascular and psychological effects, and — most relevant here — blunted adaptation to training. Muscle protein synthesis and strength gains both suffer in a low-energy state. You can train perfectly and under-recover your way to a plateau.
The warning signs the literature lists are worth reading twice: periods becoming irregular or stopping (in women not on hormonal contraception, which can mask this), frequent illness or lingering injuries, stress fractures, unexplained performance decline, constant cold, hair shedding, low libido, and mood changes. Amenorrhea in a hard-training woman is not a badge of leanness — in the consensus documents it's treated as a clinical red flag, because bone lost in your twenties and thirties may never fully come back.
For physique-focused women the tension is real: fat loss requires a deficit, but the research suggests the depth and duration of the deficit are the dial to watch. Moderate deficits with high protein, diet breaks, and a defined end date are a different animal from months of aggressive restriction layered on heavy training. And anyone whose goal is actually building muscle needs a genuine surplus or at least maintenance — the body does not add tissue while it's rationing.
None of this requires sharing anything personal publicly — ask under a username, that's what this community is here for. If several of those red flags sound familiar, a sports-medicine doctor and a ferritin and hormone panel are worth more than any supplement.
It's also worth saying plainly: RED-S is not only an elite-athlete problem, and it is not only a women's problem — the IOC framework applies to men too, and recreational lifters who chronically diet while training hard are exactly the population where it hides. The recreational version rarely looks dramatic. It looks like the woman who has eaten "clean" at a deficit for two years, trains five days a week, and wonders why her lifts, hair, mood, and cycle have all quietly gone backwards. The fix the literature points to is unglamorous: eat more, deliberately, often with professional support, and give it months.
Have you ever traced a long plateau back to simply not eating enough? What was the sign that finally made it click?
The physiology underneath is energy availability: calories eaten minus exercise expenditure, relative to lean body mass. Classic work by Anne Loucks and colleagues showed that when energy availability drops below a threshold, reproductive hormones are disrupted within days — the body triages fertility as non-essential. The IOC consensus expanded the picture beyond the old "female athlete triad": suppressed metabolism, impaired immunity, poor bone formation, cardiovascular and psychological effects, and — most relevant here — blunted adaptation to training. Muscle protein synthesis and strength gains both suffer in a low-energy state. You can train perfectly and under-recover your way to a plateau.
The warning signs the literature lists are worth reading twice: periods becoming irregular or stopping (in women not on hormonal contraception, which can mask this), frequent illness or lingering injuries, stress fractures, unexplained performance decline, constant cold, hair shedding, low libido, and mood changes. Amenorrhea in a hard-training woman is not a badge of leanness — in the consensus documents it's treated as a clinical red flag, because bone lost in your twenties and thirties may never fully come back.
For physique-focused women the tension is real: fat loss requires a deficit, but the research suggests the depth and duration of the deficit are the dial to watch. Moderate deficits with high protein, diet breaks, and a defined end date are a different animal from months of aggressive restriction layered on heavy training. And anyone whose goal is actually building muscle needs a genuine surplus or at least maintenance — the body does not add tissue while it's rationing.
None of this requires sharing anything personal publicly — ask under a username, that's what this community is here for. If several of those red flags sound familiar, a sports-medicine doctor and a ferritin and hormone panel are worth more than any supplement.
It's also worth saying plainly: RED-S is not only an elite-athlete problem, and it is not only a women's problem — the IOC framework applies to men too, and recreational lifters who chronically diet while training hard are exactly the population where it hides. The recreational version rarely looks dramatic. It looks like the woman who has eaten "clean" at a deficit for two years, trains five days a week, and wonders why her lifts, hair, mood, and cycle have all quietly gone backwards. The fix the literature points to is unglamorous: eat more, deliberately, often with professional support, and give it months.
Have you ever traced a long plateau back to simply not eating enough? What was the sign that finally made it click?