Protocol Review
Training and Fuelling for Female Physiology
Sports science built its models on the 70-kilogram male and extrapolated outward. The result is a set of defaults — fast before cardio, eat less protein, chase the calorie burn, lift light — that are not merely suboptimal for active women. They often work against them, driving endocrine disruption, metabolic conservation, and lean-mass loss.1–5
This is my read of that protocol: seven corrections, each written as a decision you can act on this week. Every section is tagged with how solid the underlying evidence actually is, because the gap between “well established” and “widely repeated” is wide in this field — and some of the most confidently stated advice sits on the thinnest ground.
Women are not smaller men. The correction is not a more fragile set of rules — it is a more demanding one.
Tap a node to open the protocol ↓
01 · Fuel before you train
Most fasting research was run in men or in sedentary populations. In active women, chronically training under-fuelled suppresses the hypothalamic–pituitary–ovarian axis and downshifts thyroid output. The body reads low energy availability as a threat and conserves — the opposite of the adaptation you trained for.4,5
- Before lifting: at least 15 g of protein, 30–60 minutes out.
- Before cardio over 45 minutes: add roughly 30 g of carbohydrate.
- Front-load the day. On hard training days, do not shorten the eating window.
Caveat. The kisspeptin-suppression mechanism is well described in animal models but only partially confirmed in humans. The practical advice — eat before you train — holds either way.
02 · Screen for RED-S, not just the Triad
Relative Energy Deficiency in Sport is far broader than disordered eating, amenorrhea, and osteoporosis together. Low energy availability degrades immunity, protein synthesis, mood, sleep, iron status, and bone remodelling well before a cycle disappears.1
- Run the LEAF-Q once or twice a year — short, validated, and free.
- Treat repeated illness, shin pain, stalled progress, poor sleep, low libido, cold extremities, or any cycle change as flags.
- Fix the numerator first: energy availability improves faster by eating more than by training less.
03 · Raise protein; spread it across the day
The 0.8 g/kg RDA prevents deficiency in sedentary adults. It was never an optimum for people who train. Muscle protein synthesis also responds to a leucine threshold, so four moderate doses beat one large one. Anabolic resistance in the menopausal transition pushes the useful range higher.2,5
- Daily total: 1.6–2.2 g/kg. Go toward the top in a deficit, or post-menopause.
- Per meal: 30–40 g, roughly 0.4 g/kg, three to four times a day.
- Aim for about 2.5–3 g of leucine per dose from dairy, eggs, meat, fish, soy, or a blended plant protein.
Caveat. The strict 45-minute “anabolic window” has largely been superseded. And 2.2–2.4 g/kg as a floor sits above most consensus ranges; it is not required.
04 · Polarize your cardio
Easy aerobic volume builds real capacity. The problem is living in the moderate middle: hard enough to accumulate fatigue, not hard enough to force adaptation. Polarize: most work genuinely easy, a small fraction genuinely hard, very little in between.
- Split roughly 80/20: conversation-pace most of the minutes; true high intensity for the rest.
- One to two interval sessions a week — for example 6–10 rounds of 30 seconds all-out with 2–4 minutes recovery.
- Separate hard cardio from heavy lifting by at least six hours, or put them on different days.
Caveat. Polarization is well supported as an endurance principle. The stronger claim — that women should minimize Zone 2 — is not well established. Zone 2 still earns its keep.
05 · Lift heavy and land hard
Strength and hypertrophy respond to load and progressive overload the same way in both sexes. Visible bulk is a function of volume and calorie surplus, not of picking up a heavier dumbbell. Heavy loading plus impact is also the strongest non-pharmaceutical lever on bone mineral density.2,3
- Two to four sessions a week on squat, hinge, press, row, carry.
- Strength blocks: 3–6 reps at 80–90% of one-rep max, stopping 1–3 reps short of failure.
- Add impact three times a week: 10–20 jumps, hops, or controlled drop landings. Two minutes. That is the bone stimulus.
06 · Track your own cycle before periodizing around it
Meta-analyses of cycle-phase effects on performance find small average effects with very high variability, and most of the underlying studies are methodologically weak. Averages are the wrong tool. The useful signal is yours.1,5
- Log three full cycles: cycle day, sleep, session RPE, top-set load, mood, symptoms.
- Some athletes show a clear luteal dip; many show none. Adjust what your data supports.
- Expect luteal-phase heat and fluid shifts: higher core temperature, more perceived effort in the heat, higher sodium and fluid needs.
07 · Time your recovery inputs
Recovery tools are not good or bad in the abstract. Cold immersion right after resistance training blunts the signalling you lifted to create. Heat exposure drives plasma-volume expansion and complements training. Iron absorption is gated by hepcidin, which rises for several hours after exercise.5
- Sauna after training: 15–20 minutes, three to four times a week.
- Keep cold away from hypertrophy work — six hours or more, or reserve it for conditioning days.
- Test ferritin before supplementing. If deficient: iron in the morning with vitamin C, on alternate days.
Caveat. The cold-blunts-hypertrophy and alternate-day-iron findings are reasonably solid. Substituting adaptogens for stimulants is not — the performance evidence is thin.
01 Reasonably supported
Fuel before you train
Intermittent fasting and fasted cardio are universally optimal — they improve metabolic flexibility, burn more fat, and extend healthspan for everyone.
- Before lifting: at least 15 g of protein, 30–60 minutes out.
- Before cardio over 45 minutes: add roughly 30 g of carbohydrate.
- Front-load the day: weight calories toward morning and midday rather than a late compressed window.
- On hard training days: do not shorten the eating window. Fasting and heavy training are competing stressors.
Caveat. The kisspeptin-suppression mechanism is well described in animal models but only partially confirmed in humans. Eat before you train regardless of which mechanism turns out to dominate.
02 Well established
Screen for RED-S, not just the Triad
Under-fuelling only matters if it produces the Female Athlete Triad: disordered eating, amenorrhea, and osteoporosis together. A regular cycle at a normal body weight means there is no problem.
Relative Energy Deficiency in Sport (RED-S) is the current consensus framework and it is far broader. Immunity, protein synthesis, mood, sleep, iron status, and bone remodelling degrade well before a cycle disappears. Waiting for amenorrhea means waiting years.1
- Run the LEAF-Q once or twice a year — it is short, validated, and free.
- Treat these as flags: repeated minor illness, stress fractures or shin pain, stalled progress despite good training, poor sleep, low libido, cold hands and feet, cycle changes of any kind.
- Escalate early. A sports dietitian or physician can order ferritin, a thyroid panel, and vitamin D before things become structural.
- Fix the numerator first. Energy availability improves faster by eating more than by training less, and eating more preserves fitness.
03 Well established
Raise protein; spread it across the day
0.8 g/kg/day is adequate, timing is irrelevant as long as the daily total lands, and women need less protein than men.
The RDA prevents deficiency in sedentary adults — it was never an optimum for people who train. Active adults do better at roughly double that. Per-meal distribution matters: muscle protein synthesis responds to a leucine threshold, so four moderate doses beat one large one. Anabolic resistance in the menopausal transition pushes the useful range higher.2,3,5
- Daily total: 1.6–2.2 g/kg body weight. Go toward the top of that range in a calorie deficit, or post-menopause.
- Per meal: 30–40 g of protein, roughly 0.4 g/kg, three to four times a day.
- Around training: get a full dose within a couple of hours either side. The window is wide, not narrow.
- Source quality: prioritize leucine-rich proteins — dairy, eggs, meat, fish, soy, or a blended plant protein. Aim for about 2.5–3 g of leucine per dose.
Caveat. Two claims in circulation overshoot the evidence. The strict 45-minute “anabolic window” has largely been superseded — daily total and per-meal distribution dominate. And 2.2–2.4 g/kg as a floor sits above most consensus ranges; it is not harmful, but it is not required either.
04 Reasonably supported
Polarize your cardio
Long, moderate-intensity cardio is the most effective way to change body composition.
Easy aerobic volume builds real mitochondrial and cardiovascular capacity. The problem is spending most of your training in the moderate middle, which is hard enough to accumulate fatigue but not hard enough to force adaptation. A polarized distribution fixes this: most work genuinely easy, a small fraction genuinely hard, very little in between.
- Split roughly 80/20: four-fifths of your cardio minutes easy enough to hold a conversation, one-fifth at true high intensity.
- Add one to two interval sessions a week: for example 6–10 rounds of 30 seconds all-out with 2–4 minutes of recovery.
- Keep easy days actually easy. Most people’s easy runs are too hard and their hard sessions too soft.
- Separate hard cardio from heavy lifting by at least six hours, or put them on different days.
Caveat. Polarization is well supported as a general endurance principle. The stronger claim — that women specifically require high intensity and should minimize Zone 2 — is not well established, and Zone 2 carries independent metabolic and cardiovascular benefits worth keeping.
05 Well established
Lift heavy and land hard
Light weights and high reps produce a “toned” look and avoid bulk. Every set should go to failure.
Strength and hypertrophy respond to load and progressive overload the same way in both sexes; visible bulk is a function of training volume and calorie surplus, not of picking up a heavier dumbbell. Heavy loading combined with impact is also the single strongest non-pharmaceutical lever on bone mineral density — bone responds to strain magnitude and rate, which light circuits simply do not produce.2,3
- Two to four sessions a week built on compound lifts: squat, hinge, press, row, carry.
- Strength blocks: 3–6 reps at 80–90% of one-rep max.
- Stop 1–3 reps short of failure. It produces comparable adaptation with markedly less fatigue and joint cost.
- Add impact work three times a week: 10–20 jumps, hops, or controlled drop landings. This is the bone stimulus, and it takes two minutes.
- Progress something every week — load, reps, or sets. Without progression, the rest is just exercise.
06 Contested — individualize
Track your own cycle data before periodizing around it
Either the cycle makes women too unpredictable to train seriously, or a fixed phase-based template — push in the follicular phase, back off in the luteal — is the answer.
Both overstate what is known. Meta-analyses of cycle-phase effects on performance find small average effects with very high variability between individuals, and most of the underlying studies are methodologically weak. Oral contraceptives do suppress endogenous ovarian hormones, but the measured performance effect at a group level is likewise small. Averages are the wrong tool here: the useful signal is your own.1,5
- Log three full cycles: cycle day, sleep, session RPE, top-set load, mood, symptoms. Any tracker or a spreadsheet works.
- Look for your pattern, not the textbook pattern. Some athletes show a clear luteal dip; many show none.
- Adjust what the data supports — usually scheduling the heaviest sessions in your best week and adding volume tolerance elsewhere.
- Expect luteal-phase heat and fluid shifts: higher core temperature, more perceived effort in the heat, higher sodium and fluid needs.
- Decide on contraception with a clinician on individual grounds. Framing it as a performance decision alone is not supported.
07 Reasonably supported
Time your recovery inputs
Ice bath immediately after every session, take iron daily to be safe, and pre-workout stimulants work the same for everyone.
Recovery tools are good or bad at a specific time relative to a specific session. Cold immersion right after resistance training blunts the signalling you lifted to create. Heat exposure drives plasma-volume expansion and complements training rather than competing with it. Iron absorption is gated by hepcidin, which rises for several hours after exercise, so dose timing matters more than dose frequency.5
- Sauna after training: 15–20 minutes, three to four times a week, for plasma volume and heat adaptation.
- Keep cold away from hypertrophy work. Separate by six hours or more, or reserve it for conditioning days. Milder temperatures around 55°F are sufficient.
- Test ferritin before supplementing iron. Supplementing without a deficit is pointless and can be harmful.
- If you are deficient: take iron in the morning with vitamin C, on alternate days — alternate-day dosing absorbs better than daily.
- Caffeine works in women too: 3–6 mg/kg is the usual effective range. Dose to body mass rather than following a scoop line.
Caveat. The cold-blunts-hypertrophy and alternate-day-iron findings are reasonably solid. The recommendation to substitute adaptogens for stimulants is not — the evidence for adaptogens on athletic performance is thin.
Where to start
Trying to change seven things at once is how programmes fail. Mark what is true of you today — the plan below keeps only those gaps, in order of leverage.
Nothing toggled yet, so this is the default four-week sequence. Mark what is true of you today to compress it.
Fuel
Eat before training and hit your protein target. Highest-leverage change; everything downstream works better.
Load
Move lifting to heavy compounds at 1–3 RIR. Add two minutes of jumps three times a week.
Distribute
Audit your cardio. Push the moderate middle out toward the easy and hard ends.
Measure
Start a cycle and session log. Get ferritin, thyroid, and vitamin D tested so you are working from data.
Women are not smaller men. But the correction is not a separate, more fragile set of rules — it is a more demanding one: eat more, lift heavier, land harder, and measure your own physiology instead of borrowing someone else’s averages.
References
- Different perspectives on women’s health, nutrition and endurance exercise. PubMed Central, National Institutes of Health. pmc.ncbi.nlm.nih.gov/articles/PMC11018311
- 4 life-changing lessons from the world’s best studies on exercise for women, by a female physiologist. Women’s Health UK. womenshealthmag.com
- Mainstream Menopause Advice is Misleading Active Women. Dr. Stacy Sims. drstacysims.com
- You Are an Athlete and You Shouldn’t Practice Intermittent Fasting. Dr. Stacy Sims. drstacysims.com
- Huberman Lab podcast with Dr Stacy Sims. hubermanlab.com
This article summarizes general evidence and is not individual medical advice. Decisions about contraception, iron supplementation, thyroid function, and suspected energy deficiency should be made with a qualified clinician.