Endurance Runner · Composite story

Low ferritin on a good diet: the runner who fixed the pressure first

A composite marathon runner raised energy scores and brought ferritin into range with her clinician by pairing stress down-shifts, mineral hydration and iron-smart meals.

This is a composite story, built from patterns I see often. Details are illustrative, not one person's record.

She was training for her third marathon, eating steak twice a week, lentils most days, and her ferritin kept coming back low. Her doctor had ruled out the obvious. Her legs felt like wet sand on hill repeats and she was waking at 3am with her heart going.

The presenting state

Hard sessions in the evening, a job with quarterly targets, six hours of sleep on a good night. Her iron intake looked fine on paper. What didn't look fine was the pressure: she was almost never in a calm state long enough for her body to stop hiding iron.

Hepcidin, the liver hormone that closes the iron door, climbs after hard training and with ongoing inflammation. She was stacking both.

What changed

  • Training timing. Hard sessions moved to mornings, never on her worst sleep nights.
  • A mineral drink mid-morning. Coconut water, magnesium glycinate, a pinch of salt, lemon.
  • One iron-smart meal a day. Vitamin C on the plate, coffee moved an hour away.
  • A daily down-shift. Five minutes of long exhales before bed.
  • Tracking. Energy, sleep, iron meals and training load logged in the Nervous System Journal, with meal photos in the Fuel Room.

Her clinician handled bloods and any supplement decisions.

What moved

Over twelve weeks her self-rated energy climbed, the 3am wake-ups faded, and her retest came back in range. The diet barely changed. The pressure did.

Why it worked

Iron needs an open door. Lowering the pressure on her system gave the food she was already eating a chance to count.

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