You can run well on too little fuel for a long time. Right up until you can't.

This week, Coach Amanda and Coach Nick sit down with Dr. Melissa Lodge (PhD in exercise science and sports nutrition, RD-in-progress, and the mind behind @fed_collaborative) to unpack REDs: Relative Energy Deficiency in Sport. It's one of the most misunderstood, under-screened issues in endurance running, and it does not have a look.

We get into why low energy availability sneaks up on runners (intentional and inadvertent), why weight is a terrible way to diagnose it, and the hidden biomarkers worth advocating for on your next blood panel (hi, T3). Melissa breaks down what's actually happening beneath the surface when you underfuel: bone loss, suppressed hormones, disrupted cholesterol, and a body quietly triaging which systems it can afford to keep running.

We also cover:

• Why a "withdrawal bleed" on hormonal birth control isn't a period, and what you lose as a vital sign
• The adolescent window for bone development that you genuinely cannot get back (essential listening for parents and coaches)
• Within-day energy deficits, backloading calories, and why "I fueled my long run" isn't the finish line
• How to raise concerns with a teammate or friend without pointing fingers
• The carbohydrate revolution in endurance sport, and the trap of nailing one thing while ignoring the other 22 hours of your day

The throughline, in true Running Explained fashion: nail the basics first. Eat enough, eat often, and stop making fueling harder than it needs to be.

Bio: Melissa Lodge, PhD, is an exercise physiologist and soon-to-be RD. Her research focuses on the physiological and psychological impacts of Relative Energy Deficiency in Sport (REDs), particularly in female athletes. As a former elite runner, Melissa is especially interested in REDs prevention to improve the health and performance of athletes across the lifespan. Melissa also runs the social media platform @fed_collaborative, where she translates complex research on exercise physiology, REDs, and sports nutrition.

Find Melissa on Instagram at @fed_collaborative.

This episode touches on disordered eating and bone health. If any of it hits close to home, please reach out to a sports-medicine-informed physician or dietitian.

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Nick IG

Email - Hello@runningexplained.com

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It's getting hot out there, and your fueling and hydration plan needs to keep up. Registered dietitian and board-certified sports nutritionist Stevie Lyn Smith (fresh off running 460-ish miles from Buffalo to Brooklyn, as one does) joins Coach Nick and Coach Amanda to break down what actually changes when the temperature climbs.

We get into why more electrolytes isn't automatically better, the real reason carb-based sports drinks help you absorb water faster, and how to run a simple sweat test at home so you can stop guessing. Stevie walks through her own half Ironman fueling strategy (carbs, caffeine timing, and cooling tricks included), what to grab on course when your gut says no to one more gel, and how to think about caffeine dosing without ending up with heart palpitations on the treadmill.

Then we go down a couple of rabbit holes you asked for: iron and ferritin (when to supplement versus when to dig into the why), and peptides (spoiler: the human research is thin, and we aren't rats). Evidence-based, occasionally unhinged, zero filler. Exactly how you like it.

Find Stevie on Instagram, stevielynrd.com, and on her podcast Real Fuel with SLS. Grab her book Power Up: A Young Woman's Guide to Winning with Sports Nutrition wherever books are sold.

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Nick IG

Email - Hello@runningexplained.com

Ready to finally train with a plan that’s built around YOU?

✅ Personalized training

✅ Weekly support + adjustments

✅ Strategy, structure, and accountability

✅ Expert coaching to help you actually hit your goals

Not ready for a 1:1 Coach

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🤝Group Coaching, Strength Training and Unlimited access to

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to find the right training plan for you!

What's it actually like to finish a marathon after the crowds have gone home, the aid stations are packed up, and you're getting moved to the sidewalk at mile 22?

This week Coach Amanda and Coach Nick sit down with Avelyn, a proud back-of-the-pack runner who went from zero to three marathons in two years. She takes us inside the Walt Disney World Marathon and the famous balloon ladies, running New York as the crowds thin, and a brutally honest account of Boston: the unspoken bond she formed with two strangers on course, the ugly cry at mile 24, and why she chose gratitude over rage in a race that wasn't built for runners like her.

We get into why run-walking is real running, why "faster" and "better" aren't the same thing, how to define success beyond a finish time, and why what's happening in your body is nobody else's business. If you've ever felt too slow for this sport, this one's for you.

Avelyn is a Latina, born and raised New Yorker currently living in Atlanta, GA with her rescue pup, Georgia. She started running in February of 2024 with the goal of running her very first marathon. Since then Avelyn has completed three marathons and has built an online community by showing ordinary people that they can do extraordinary things.

Amanda IG Nick IG

Email - Hello@runningexplained.com

Ready to finally train with a plan that’s built around YOU?

✅ Personalized training

✅ Weekly support + adjustments

✅ Strategy, structure, and accountability

✅ Expert coaching to help you actually hit your goals

Not ready for a 1:1 Coach

📝PDF Training Plan Templates available

🤝Group Coaching, Strength Training and Unlimited access to

all Training Plans available in The Run Club App

Not sure talk our Training Plan Quiz to find the right training plan for you!