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Is it safe to exercise while fasting? What if you're a recreational runner? A woman? Or trying to lose weight?

In this episode, I’m joined by the brilliant Kira Sutherland, a naturopath and sports nutritionist with over 25 years of clinical experience and a deep passion for endurance sports. Together, we unravel the science (and myths) behind fasting and athletic performance.

Kira shares practical, evidence-informed insights about:

• 🕒 The different types of fasting (intermittent, dry, Ramadan, fasted training)
• 💪 How fasted exercise influences fat adaptation, performance, and recovery
• ⚠️ Common mistakes athletes make with fasted training
• 👩‍🦰 Why women respond differently to fasting than men (and what to do about it)
• 🍽 The truth about post-exercise eating windows and what matters most
• 🧠 Why the body’s natural rhythms may matter more than your fasting schedule
• 📆 How often and when runners should fast depending on their goals

Whether you're curious about using fasting for performance, longevity, gut health, or fat loss — this episode will help you understand how to do it safely, effectively, and in sync with your body.

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In this episode, Brodie dives into three new studies aimed at helping runners prevent injury and understand how tech and biomechanics affect performance. Whether you're a recreational runner or an aspiring marathoner, these findings offer practical, science-backed takeaways.

Featured Studies & Key Insights

Asymmetry & Bone Stress Injuries

Study Title: Can biomechanical variables and asymmetry predict bone stress injuries in collegiate distance runners?

• ✅ Key Finding: Even small left-to-right asymmetries may increase injury risk — particularly for female runners.
• 🧍‍♂️ Implication: Asymmetry under 10% was still meaningful in injury prediction. Don’t ignore minor imbalances in cadence, step length, or ground reaction force.
• 🧠 Tip: Wearables that track contact time or vertical oscillation may help identify early imbalances before pain begins.

Strength & Flexibility Self-Assessments for Marathoners

Study Title: Strength and Flexibility Self-Assessment and Subsequent Training Injuries Among Recreational Runners of the NYC Marathon

• ✅ Key Finding: The single-leg glute bridge was the only test significantly associated with injury risk.
• ❌ Flexibility tests (sit & reach, quad stretch) and other strength tests (planks, heel raises, push-ups) had no predictive value.
• 🏠 DIY Test: If you can’t hold a single-leg glute bridge for >20 seconds on your weaker side, your injury risk may be higher.

Super Shoes & Injury Risk

Study Title: Technology Advanced Running Shoes Reduce Biomechanical Factors of Running-Related Injury Risk

• 👟 Super shoes (like Nike Alphafly) encouraged mid/forefoot striking without increasing joint or muscle strain.
• ✅ They reduced load on key areas like the ankle joint, soleus, and peroneus longus.
• ❗️Minimalist shoes, on the other hand, tripled ankle joint forces and heavily loaded the calf and foot — a risk for Achilles and metatarsal injuries.
• ⚠️ Caution: Transition slowly into super shoes or minimalist footwear. Your body needs time to adapt to new mechanics.

Practical Takeaways for Runners

• Monitor asymmetries using wearables or self-awareness — don’t wait for pain.
• Use the glute bridge hold as a simple strength test at home. Aim for >20 seconds on both sides.
• Super shoes aren’t just for speed — they may actually help with injury prevention, especially for habitual forefoot strikers.
• Avoid going cold turkey into minimalist shoes unless you're conditioned for it.

📚 Want to Go Deeper?

🔍 All referenced studies are stored in the Run Smarter Research Database — accessible for just $8.99/month.
💬 Plus, get access to the Run Smarter AI Assistant, which answers your running questions based on podcast episodes, papers, and course content.

👉 Click here to explore membership options

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- The Run Smarter Book 📖
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In this episode of the Run Smarter Podcast, Brodie sits down with world-renowned sports dietitian and researcher Professor Louise Burke to clear the air on one of the most debated topics in endurance sport: low-carb vs high-carb diets.

After receiving listener pushback from a previous episode on low-carb nutrition, Brodie brings in Louise — who has decades of elite-level experience and research — to explore:

• The theory behind fat-adaptation and low-carb, high-fat diets
• Whether the science supports keto for endurance performance
• The trade-offs between fuel efficiency, oxygen use, and high-intensity output
• What recreational runners should consider when planning their fueling strategies

Louise also shares:

• When keto may be appropriate (hint: not for everyone!)
• How to train your gut to tolerate more carbs
• The dangers of extreme diet restriction
• Why individual response should guide your nutrition plan
• Her concerns around misinformation, particularly in female athlete nutrition

🧠 Key Takeaways:

• Yes, keto increases fat burning, but it can impair high-intensity performance due to reduced oxygen efficiency.
• Carb periodisation—adjusting intake based on session intensity—is a smart strategy for most runners.
• Carbohydrate source and quality matter just as much as quantity.
• Training the gut is essential if you're increasing carb intake for race day.
• Avoid extreme rigidity in diets. Nutrient density, food range, and enjoyment are critical for long-term success.

💬 Quotes to Remember:

Follow Prof Louise Burke on Twitter (X)

For MORE Run Smarter Resources 🏃‍♂️📚
- Including Free Injury Prevention Courses 🩹🎓
- The Run Smarter Book 📖
- Access to Research Papers 📄🔍
- & Ways to Work with Brodie 🤝👟
👉 CLICK HERE! 🎉✨