Source notes

When food intake falls short of an athlete's needs, recovery involves more than regaining weight. The female athlete triad connects inadequate energy, disrupted reproductive function and impaired bone health. This update adds a separate model for adolescents and emphasizes that these problems develop and recover at different rates. In one cited 12-month nutrition trial involving exercising women with absent or infrequent periods, increasing food intake improved menstrual frequency without improving bone mineral density. A returning period was an important step, but did not consistently mean normal ovulation or hormone exposure had returned.

The paper broadens assessment beyond a calculation of food energy minus exercise expenditure. The body may conserve energy through changes in resting metabolism and hormones, even while weight appears stable. It also questions a universal energy threshold for menstrual disruption. These distinctions help explain why a single weight reading or food calculation cannot fully describe the physiological effects of under-fuelling.

How Does This Show Up in Real Life?

For a female athlete whose periods have become irregular, the practical question is not simply whether the scale has stopped moving. The authors recommend considering energy status, reproductive function and bone health together, with attention to other possible causes of menstrual changes. Recovery should include sustained menstrual improvement rather than treating one returning period as the finish line. Adolescents require particular care because growth and bone development are still underway. The paper notes that roughly 40–50% of adult bone mineral content accumulates between ages 11 and 18 in girls. Its adolescent model therefore considers growth trajectories and time since the first period, rather than applying adult measurements unchanged. This is a framework for clinical assessment, not an individual calorie prescription.

The evidence includes controlled trials and observational studies, with different strength across topics. The adolescent framework is an initial model needing further study. Complete bone recovery after improved nutrition remains uncertain, and short follow-up may miss slower changes. Evidence concerning other injuries and long-term cardiovascular consequences is less established than evidence for reproductive and bone effects.

Why We Cite It

Alpekin can use this paper to distinguish early improvement from a complete recovery endpoint in discussions of exercise-related health. It also helps assess whether recommendations developed for adults have evidence appropriate to a growing teenager, an important distinction when explaining research to families and younger participants in sport.

The update gives substantial reasons to take persistent menstrual changes seriously while avoiding a single explanation for every case. Its strongest contribution is a clearer account of what clinicians need to follow over time and where reassuring early changes still leave uncertainty.