Nutrition for Active Women: Fueling Enough for the Work
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Medical disclaimer: Inna is a NASM-certified personal trainer, not a physician or registered dietitian. This article discusses low energy availability, a condition requiring medical diagnosis. Missing periods, persistent fatigue, or recurring injuries warrant evaluation by a physician, not self-management.
Nutrition for active women has one failure mode that outweighs every other, and it is not the one the industry sells you supplements for. It is eating too little for the training you are doing. The International Olympic Committee has a name for what follows, and understanding it changes how you read your own symptoms.
This article belongs to my meal planning guide for women and sits under my broader nutrition guide.
Nutrition for Active Women Starts With Energy Availability
So why do two women eating the same amount end up in different places? Because the number that matters is not how much you eat. It is how much is left over after training.
Energy availability means the energy remaining to run your body once exercise has taken its share. Eat 2,000 calories and burn 600 in a session, and your body has 1,400 to run everything else: your heart, your brain, your immune system, your reproductive hormones.
The one training six hours a week and the one training twelve are not comparable, even on the same plate.
The IOC’s 2023 consensus statement describes this as a continuum. Mild and transient low energy availability is termed adaptable, while problematic low energy availability is associated with adverse outcomes across energy metabolism, reproductive function, musculoskeletal health, immunity, glycogen synthesis. A hard training block with slightly low intake is not the same as months of it.
What REDs Actually Is
Relative Energy Deficiency in Sport, or REDs, is the syndrome that develops when problematic low energy availability persists.
What it affects, per the consensus: bone health, menstrual function, immune response, metabolic rate, cardiovascular health, gastrointestinal function, psychological wellbeing. It is not a single symptom. It is a system-wide downshift.
Two corrections to what circulates online. REDs occurs in men as well as women, and the 2023 statement explicitly advanced understanding of it in male athletes. And it does not require an eating disorder. Plenty of women arrive here through a training increase that never came with a matching food increase, with no disordered intent at all.
Signs worth taking seriously: your period becoming irregular or stopping, recurring stress fractures or bone injuries, catching every illness that passes through, performance declining despite consistent training, persistent fatigue that sleep does not fix, feeling cold constantly.
If several of those describe you, the next step is a physician rather than a nutrition article. REDs requires clinical diagnosis, and the IOC developed an assessment tool specifically because it is difficult to identify without one.
Nutrition for Active Women: The Actual Numbers
Assuming you are fueling adequately, here is what the intake looks like.
Protein: 1.6 to 2.2 grams per kilogram of body weight daily. The practical approach is in high-protein meal prep.
Carbohydrate: this is where active women most often under-eat, and the 2023 consensus specifically highlighted inadequate carbohydrate intake as an emerging factor. For moderate training, roughly 3 to 5 grams per kilogram daily. For heavy training, 5 to 8. The detail sits in carbs for women.
Fat: not below 20 to 25 percent of total intake. It matters for hormone production, and cutting it aggressively is a common route into trouble. See