Training Nutrition for Women: What's Different and Why It Matters

Women need the same training-nutrition foundations as men: enough energy, carbohydrate and protein. Menstrual symptoms, iron losses and contraception can change how those foundations are applied. 1

Menstrual Cycle and Nutrition Periodisation

Women remain underrepresented in sports nutrition research. That warrants better evidence, not confident rules about what every woman should eat in each phase. 1

Cycles do not follow a universal 28-day timetable. Symptoms and performance responses vary, and research does not support prescribing everyone's hardest sessions by cycle phase. 2

Energy needs may rise in the luteal phase, but a predictable 5 to 10% increase is not established for every athlete. Small studies and variable findings limit precise prescriptions. 1 3

Changes in fuel use do not mean you should replace carbohydrate with fat after ovulation. Meet carbohydrate needs throughout the cycle, especially around demanding sessions. 1

Try recording hunger, bleeding, cramps, sleep and session quality across a few cycles. Adjust meals and training around recurring symptoms, rather than an app's predicted hormone levels. 2

For training-block adjustments, see nutrition periodisation.

Iron Requirements

Menstrual blood loss increases iron needs. Iron deficiency can contribute to fatigue and reduced exercise capacity before haemoglobin falls enough to indicate anaemia. 4

Discuss testing with your GP if you have heavy periods, persistent fatigue, declining endurance or previous deficiency. Testing frequency should reflect your risks, not an automatic annual rule. 4

Ferritin reflects iron stores, but illness and inflammation can raise it. Interpret it alongside a full blood count and other iron markers, including transferrin saturation. 4

The AIS uses ferritin below 35 µg/L in its athlete assessment framework. This is not a universal performance target or a reason to self-prescribe iron. 4

Include iron-rich foods such as meat, legumes or tofu. Pair plant sources with vitamin-C-rich foods. Confirm deficiency and investigate its cause before taking iron supplements. 4

See iron deficiency in active women for more detail.

Relative Energy Deficiency in Sport and Bone Health

RED-S develops when prolonged or severe under-fuelling compromises health and performance. It affects women and men; missing a snack or having one low-intake day is not itself RED-S. 5

Warning signs include menstrual disruption, persistent fatigue, recurrent illness and bone stress injuries. Low energy availability can impair bone health; calcium and vitamin D also deserve attention. 5

Seek a GP or sports physician's assessment rather than assuming symptoms are hormonal. A sports dietitian can help restore fuelling, with training changes guided by clinical risk. 5

Fat loss may be compatible with training, but no deficit guarantees hormonal safety. If periods, recovery or performance deteriorate, reassess restriction rather than pushing harder. 5

Protein and Everyday Fuelling

Around 1.6 to 2.2 g of protein per kg of body weight daily is a practical range for many active women, within sports-nutrition guidance. Distribute it across meals. 1

Protein does not replace adequate energy or carbohydrate. A useful planning habit is to pair a protein food with carbohydrate after training, such as yoghurt with oats or tofu with rice. 1

See protein targets and food sources.

Hormonal Contraception

Hormonal contraception changes hormonal patterns, and methods differ. Natural-cycle nutrition advice cannot simply be transferred to pill weeks. Discuss symptoms and concerns with your prescriber. 1

Do not assume contraception requires extra B vitamins, magnesium or zinc. Review dietary gaps or suspected deficiency individually rather than buying a routine supplement stack. 1

For help turning these principles into everyday meals, explore our nutrition coaching.

References

1.Sims ST, et al. International society of sports nutrition position stand: nutritional concerns of the female athlete. Journal of the International Society of Sports Nutrition. 2023;20(1):2204066.[Professional guidance; some recommendations rely on limited female-specific research.] doi:10.1080/15502783.2023.2204066

2.Australian Sports Commission. The menstrual cycle. Clearinghouse for Sport.[Official evidence resource covering individual symptoms and research limitations.] Source

3.Kuikman MA, et al. Effect of Menstrual Cycle Phase and Hormonal Contraceptives on Resting Metabolic Rate and Body Composition. International Journal of Sport Nutrition and Exercise Metabolism. 2024;34(4):207–217.[Small athlete study; an erratum is indexed. No numerical findings are reproduced.] doi:10.1123/ijsnem.2023-0193

4.Australian Institute of Sport. Iron Supplement Best Practice Guidelines. August 2022.[Full guideline available through the official landing page; intended for high-performance sport.] Source

5.Mountjoy M, et al. 2023 International Olympic Committee’s (IOC) consensus statement on Relative Energy Deficiency in Sport (REDs). British Journal of Sports Medicine. 2023.[Clinical consensus; assessment requires consideration of alternative diagnoses.] doi:10.1136/bjsports-2023-106994

Quick answers

Do women need more carbs in the follicular phase?

Not automatically. Match carbohydrate to session length and intensity throughout the cycle. Adjust for your symptoms rather than following fixed calendar rules.

What ferritin level should active women aim for?

There is no universal performance target. Ferritin needs interpretation alongside haemoglobin, other iron markers, symptoms and recent illness or training.

How do I know if I have RED-S?

Missed periods, persistent fatigue, recurrent illness or bone stress injuries warrant assessment. These signs have other possible causes, so seek medical advice rather than self-diagnosing.

Does the pill change my training nutrition?

It changes hormonal patterns, so natural-cycle calendar advice may not apply. Plan around training and symptoms, and discuss concerns with your prescriber rather than adding supplements automatically.

How much protein do active women need?

Around 1.6 to 2.2 g per kg of body weight daily is a practical range for many active women. Spread it across meals, while also meeting energy and carbohydrate needs.