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Your Training Isn’t Broken—Your Fueling Is: RD Cortney Berling on Solving RED-S and Getting Faster
Most runners think their biggest limiter is training volume, paces, or genetics.
Cortney Berling says it’s something much simpler: you’re not eating enough.
Fresh off a 2:52:49 finish at the 2025 Eugene Marathon and armed with her credentials as a Registered Dietitian (MPH, RD, CDE), Cortney sits down to unpack RED-S (Relative Energy Deficiency in Sport): what it is, why it matters, and how to fix it before it derails your running and your health.
Cortney’s perspective is unique because she’s lived it on every stage: from a 3,000m steeplechase PR of 11:05.95 at the University of Cincinnati…
The skinny
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