#216 The Science of Running Nutrition: What You Didn't Know About Sweat and Performance

#216 The Science of Running Nutrition: What You Didn't Know About Sweat and Performance

On this episode, Andrea is joined by a very special guest: Dr. Allen Lim, founder of Skratch Labs. Allen gives us a breakdown on everything nutrition and hydration for endurance athletes. How should you fuel before/during the run? How do you measure and apply your sweat rate to how you hydrate? What role does protein play in recovery? And much more!

While working as a sport scientist and coach for a professional cycling team, Dr. Allen Lim started making his own training food and sports drinks from scratch for the cyclists because too many of the pre-packaged sports bars and drinks that were marketed or given to them were laden with artificial ingredients and literally making them sick to their stomach. Eventually, he started making a “secret drink mix” in his kitchen using a recipe with less sugar, more sodium, and no artificial sweeteners, flavors, or colors, with a simple and clean taste created by using real fruit. Soon, word of the "Secret Drink Mix" was spreading fast and it was clear that the demand for our all natural drink mixes extended far beyond cyclists or endurance athletes. To meet the growing demand, Allen put together a team of close friends and they decided to let the secret out by opening a little company in Boulder, Colorado called Skratch Labs.

Head over to ⁠⁠⁠⁠⁠⁠Skratch⁠⁠⁠⁠⁠⁠'s website and save 20% on your first order with code DOCTORSOFRUNNING!

Chapters

  • 0:00 - Intro
  • 5:05 - How Skratch's products have developed over time
  • 13:48 - Would it be better for some to not eat if they're limited on time before their run?
  • 17:26 - How to measure and apply your sweat rate to your nutrition
  • 26:04 - What is glycogen?
  • 31:22 - Why is protein important for endurance athletes?
  • 36:50 - What happens physiologically when you "bonk"?
  • 40:42 - Wrap-up

Episoder(304)

#290 Buy or Sell: Data is Overrated? Banning Water Cups at Marathons? Super Trainers are Better?

#290 Buy or Sell: Data is Overrated? Banning Water Cups at Marathons? Super Trainers are Better?

Matt and David are back with a new installment of Buy or Sell. They debate the merits of data versus hands-on testing in shoe reviews and make the case that the era of 35-39mm being considered max cus...

22 Apr 1h 2min

#289 The Science of Walking Shoes

#289 The Science of Walking Shoes

Matt, Nathan, and David lace up for a deep dive into the biomechanics of walking and what they mean for footwear. They break down how the foot moves through the gait cycle, what characteristics make a...

15 Apr 1h 7min

#288 Mailbag! Best Stable Max Cushion? Shoes for Knee Pain? Training While Sick?

#288 Mailbag! Best Stable Max Cushion? Shoes for Knee Pain? Training While Sick?

Nathan, David, and Matt dig into the mailbag to tackle your questions. They compare the On Cloudmonster Hyper 3 and Saucony Endorphin Azura and help a listener find a road shoe similar to the Puma Dev...

8 Apr 1h 3min

#287 The Latest on Super Shoe Research 2.0: Matching Up to Your Running, Known Effects on the Body, How to Adapt Appropriately

#287 The Latest on Super Shoe Research 2.0: Matching Up to Your Running, Known Effects on the Body, How to Adapt Appropriately

Matt is joined by Dr. Iain Hunter of Brigham Young University's Exercise Science department for an evidence-based deep dive into the science of super shoes. Drawing on his own research, Dr. Hunter exp...

1 Apr 1h

#286 Our Favorite Shoes of 2026 So Far, and David’s Running the Boston Marathon!?

#286 Our Favorite Shoes of 2026 So Far, and David’s Running the Boston Marathon!?

The beginning of 2026 has been absolutely loaded with new shoe releases, and David and Andrea are here to pick their Top 3 (plus a few honorable mentions) for the year so far, including picks from On,...

25 Mar 1h 15min

#285 Sharing Our Strength Routines, Debunking Weightlifting Myths, and What We’re Testing

#285 Sharing Our Strength Routines, Debunking Weightlifting Myths, and What We’re Testing

Weightlifting: runners know it has a myriad of benefits but it can be a struggle to fit it into already full training and life schedules. Matt & Nathan are here to help. They dive into the physiology ...

18 Mar 56min

#284 Mailbag! Is There Real Science Behind Recovery Shoes? Best Stable Neutral Long Run Shoes? Lightweight vs. Max Cushion?

#284 Mailbag! Is There Real Science Behind Recovery Shoes? Best Stable Neutral Long Run Shoes? Lightweight vs. Max Cushion?

Time to open up our mailbox for your questions! Nathan, Matt, and David join up to tackle questions about recovery runs, compression gear, stable neutral long run shoes, and much more. Want your quest...

11 Mar 1h 6min

#283 Breaking Down the Cielo X1 with Hoka

#283 Breaking Down the Cielo X1 with Hoka

Hoka's making big strides in 2026 with a big updated to their top-tier distance racing shoe: the Cielo X1 3.0. Matt is joined by Rebekah Broe, Senior Director of Product Performance Footwear at HOKA, ...

4 Mar 51min

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