Energy balance
Within-day energy deficiency, where energy intake and expenditure are assessed in 1-hour intervals, reveals that athletes with menstrual dysfunction spend significantly more time in an energy-deficient state (>300 kcal deficit) than eumenorrheic athletes, even when total daily energy availability appears similar.
Don't just look at your total daily calories. If you train hard, ensure you are eating enough *around* your training sessions. Spreading your intake to avoid large deficits during and immediately after exercise may help protect your hormonal health, even if your total daily calories look okay on paper.
Despite similar EA, female endurance athletes with menstrual dysfunction spent more time (22 vs. 18 h) in an energy deficient state exceeding 300 kcal compared to eumenorrheic athletes [55].
Why this rating
Based on only two studies (one male, one female) examining within-day energy balance; viability is noted as unclear.
Source
Low Energy Availability in Athletes 2020: An Updated Narrative Review of Prevalence, Risk, Within-Day Energy Balance, Knowledge, and Impact on Sports Performance
Danielle M. Logue et al. · Nutrients · 2020
DOI 10.3390/nu12030835
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