GLOSSARY

Female Athlete Nutrition Reference Table

Female-athlete nutrition is individualized; menstrual blood loss, life stage and low energy availability can create specific assessment needs.

Female Athlete Nutrition Nutrition care for female athletes that integrates adequate fueling with relevant reproductive, iron, bone and life-stage considerations.

Nutrition for a female athlete starts with adequate energy and nutrients for the actual sport, health and life stage. Menstrual history, iron losses, contraception, pregnancy and menopause can add important context. Average sex differences do not define every person's needs, and evidence from one hormonal state cannot automatically be applied to another. Ask about symptoms and preferences without assuming that menstruation requires restriction. Preserve confidentiality and use relevant health information to support care rather than to judge selection, commitment or athletic potential.

A natural menstrual cycle includes follicular development, ovulation and a luteal phase, with individual variation in timing and hormone concentrations. Calendar dates alone do not reliably verify ovulation or hormone exposure, and hormonal contraception changes the interpretation. Symptoms may influence food choice, comfort or training. Current evidence does not justify a universal phase-based nutrition prescription for all athletes. Track the individual's experience when useful, maintain adequate fueling and investigate persistent disturbances rather than attributing every performance fluctuation to a presumed cycle phase.

Menstrual dysfunction is a clinical signal with several possible causes, including pregnancy, endocrine disorders, medication and inadequate energy availability. Functional hypothalamic amenorrhea is diagnosed after appropriate evaluation, not from training volume alone. Missing periods should not be normalized as an inevitable sign of serious training. Withdrawal bleeding on hormonal contraception does not establish recovery of spontaneous menstrual function. A qualified team should assess the history, energy supply, bone health and other causes while coordinating nutrition, medical care and training decisions.

Iron assessment distinguishes depleted stores, iron deficiency without anemia and iron-deficiency anemia. Ferritin is useful but rises with inflammation, and hemoglobin can change with plasma volume. An endurance-trained athlete may have dilutional lowering of hemoglobin without true iron depletion, yet training does not exclude genuine deficiency. Consider diet, bleeding, absorption, recent illness and exercise when interpreting tests. Confirm the problem and investigate its cause before treatment; repeated unsupervised iron use can obscure the issue and create unnecessary risk.

For example, persistent fatigue and menstrual changes deserve a confidential health assessment rather than a preset cycle-based supplement routine. Review food supply, training and relevant medical causes. The athlete's symptoms and measured context should guide care, while normal individual variation should not be turned into a problem that requires unnecessary restriction.

Energy availability describes dietary energy remaining after exercise expenditure, expressed relative to fat-free mass over a defined period. It differs from whole-day energy balance and from body-fat percentage. Calculations are sensitive to errors in food records, exercise expenditure and body-composition estimates. No single threshold or short observation establishes a diagnosis for every athlete. Persistent fatigue, impaired recovery or other concerning changes warrant assessment in the broader health and training context rather than a conclusion from one calculated value.

Choose a dietary assessment method according to the question, population and resources. A recent intake record can explore meal timing around training; a frequency questionnaire can describe longer-term patterns. Neither automatically establishes exact habitual intake. Combine food details with training, access, symptoms, medication and relevant measurements. Explain uncertainties and what the method cannot answer. Good assessment produces a decision that can be reviewed, rather than an impressive nutrient report whose apparent precision exceeds the quality of the information collected.

Table references: DOI · 1 · Health Canada · 2 · NIH ODS · 3