Flex Diet Podcast

In this episode of the Flex Diet Podcast, I sit down with Paul Oneid, MS, MS, CSCS and Cody Miller for a conversation about rebuilding from injury and the transition from strength sports to endurance training.

Paul Oneid tore both quads and rebuilt himself from powerlifter to trail runner, with coach Cody Miller guiding the transition. They break down the emergent training approach, VO2 max and cardiac adaptations, and the mental side of suffering across strength sports and endurance.

In this episode, you'll learn:

How Paul's decision to move away from powerlifting and bodybuilding after tearing both quads

The emergent, responsive approach Cody used to build Paul's running base from scratch

Why cardiac structural adaptations (like resting heart rate drops) take months, not weeks

Cody's time-to-exhaustion model for structuring endurance intervals without needing lactate testing

Find Paul here:

https://masterathletic.com

https://coachescorneru.com

https://www.instagram.com/pauloneid/

Find Cody here:

https://hoopiestrength.com/

https://www.instagram.com/coach.cody.miller

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Can you really build more muscle just by rethinking how you dose leucine and essential amino acids? Dr. Daniel A. Traylor, Ph.D. — co-founder and principal scientist of LEUVATE™ — reveals the science behind protein quality, muscle protein synthesis, and why older adults may need twice the protein dose to get the same results as younger people.

We dig into mTORC1 signaling, sarcopenia, the 30g protein absorption myth, GLP-1 drug effects on muscle, and the clinical trial data behind LEUVATE™. If you care about muscle, longevity, or protein strategy, this one is loaded.

Guest Bio

Daniel A. Traylor, Ph.D. is an Assistant Professor of Health Sciences at DePaul University in Chicago and Owner, Co-Founder, and Principal Scientist of LEUVATE™. His research explores how protein quality, amino acids, and exercise interact to influence muscle adaptation, recovery, and physical function across the lifespan. He is the co-inventor of LEUVATE™ — a precision-engineered leucine-enriched nutritional formula validated across multiple peer-reviewed human clinical trials.

Timestamps

3:36 — Can you really only absorb 30g protein at once?

9:16 — Sarcopenia: the muscle-loss crisis in aging

16:01 — mTORC1 and what triggers muscle protein synthesis

20:46 — Why older adults may need twice the protein dose

30:26 — The origin story of LEUVATE™

34:01 — Leucine: the master switch for MPS

37:56 — How leucine acts as a dimmer on mTORC1

53:21 — GLP-1 drugs, muscle loss, and amino acid needs

1:06:36 — LEUVATE™ vs whey: MPS data and ongoing trials

1:17:01 — How leucine-enriched EAAs signal differently in the gut

1:27:11 — Protein spiking and supplement quality red flags

Resources

LEUVATE™

Dr. Traylor email

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In this solo episode, Dr. Mike T. Nelson introduces the concept of coaching leverage—the idea that effective coaching means multiplying physiological impact by a client's realistic ability to change.

Why sleep is a physiological powerhouse but a coaching nightmare

The coaching leverage formula: physiology × psychology

Why protein ranks #1 (score: 81) and sleep ranks #8 (score: 20)

How to stop majoring in the minors with your clients

The eight interventions inside the Flex Diet Certification

Why following a proven system beats reinventing the wheel

The Flex Diet Certification closes tonight (Monday, June 22, 2026) at midnight Pacific. Get details here.

Get the Daily Fitness Insider newsletter (free): https://www.miketnelson.com/newsletter

In this episode of the Flex Diet Podcast, I sit down with Dr. Sara Campbell, Ph.D., Associate Professor at Rutgers University, for a conversation about the bidirectional relationship between exercise and the gut microbiome.

Dr. Sara Campbell returns to discuss her lab's cutting-edge research on the bidirectional relationship between exercise and the gut microbiome — including why consumer gut tests oversimplify a complex ecosystem, how antibiotics devastate exercise capacity in animal models, and why single-microbe probiotics miss the bigger picture of functional guilds. She also shares new findings on short-chain fatty acids, amino acid metabolomics after antibiotic treatment, and the emerging neuromuscular junction hypothesis.

In this episode you'll learn:

Why consumer gut microbiome tests are misleading and what functional guilds tell us instead

How antibiotics devastate exercise capacity and the surprising metabolomic changes they cause

The current evidence on probiotics for exercise performance and why single strains fall short

What short-chain fatty acids do for gut health and exercise, and the emerging neuromuscular junction hypothesis

Find Sara here:
Rutgers Faculty Page

Google Scholar: Sara Chelland Campbell

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The Flex Diet Podcast is brought to you by the Flex Diet Certification. Learn more at miketnelson.com

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In this solo episode, Dr. Mike T. Nelson dives into the intersection of AI and coaching. Using his quest to pick up the 175-pound Inch dumbbell as an example, he shows how AI struggles with niche topics where quality training data is scarce — and why that matters for fitness advice.

Topics covered:

Why AI gave terrible advice on training for the Inch dumbbell — and what that reveals about how AI sources information

The protein-and-kidney-damage myth: when AI repeats bad science

Where AI actually helps coaches: data analysis, blood work organization, backend tasks, and production workflows

Why clients still want (and need) a real human coach — accountability, customization, and skin in the game

Will people be compliant to a robot coach? Probably not

The baseline is rising: why just writing training and nutrition programs isn't enough anymore

Flex Diet Certification — now open through Monday, June 22nd, 2026 at midnight PST. Eight interventions (protein, fats, carbs, exercise, sleep, micronutrition, fasting, and more) built on coaching leverage and metabolic flexibility. Includes direct email access to Dr. Nelson for enrolled students.

Enroll now: https://miket.me/fdc

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