4.5 • 758 Ratings
🗓️ 4 August 2025
⏱️ 36 minutes
🧾️ Download transcript
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In Part 2 of this powerful interview, legendary protein researcher Dr. Donald Layman returns to the Optimal Protein Podcast to unpack some of the most misunderstood concepts in nutrition today—and to reveal potential groundbreaking changes to the U.S. dietary guidelines around protein, red meat, saturated fat, and carbohydrates. Dr. Layman breaks down what the science actually says about protein dosing, timing, oxidation, and muscle uptake—and who truly needs to worry about protein distribution.
Vanessa and Dr. Layman also discuss:
This conversation is essential listening for anyone serious about optimizing their fat loss, preserving muscle, and finally understanding how protein quality and quantity affect long-term metabolic health.
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The content provided in this podcast is for informational purposes only and should not be construed as medical advice. Consult with a healthcare professional before making significant changes to your diet or exercise regimen.
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| 0:00.0 | Welcome to the Optimal Protein Podcast. I'm Vanessa Spina. |
| 0:05.5 | Hello, my friends, and welcome back to the Optimal Protein Podcast. I'm your host, Vanessa, |
| 0:10.8 | and today I'm joined once again by Dr. Donald Lehman, one of the world's foremost experts on protein metabolism. |
| 0:19.8 | If you've been a longtime listener, you'll remember Dr. |
| 0:23.3 | Lehman from some of our most popular and critical episodes of this podcast as he discovered |
| 0:29.4 | things like the leucine threshold, the 30 gram of protein per meal recommendation, his research on muscle protein synthesis, and how to optimize |
| 0:40.5 | protein intake as we age. Now, today's episode is incredibly exciting because Dr. Lehman shared |
| 0:47.1 | some breaking news with me about protein recommendations and saturated fat and red meat and carbohydrate recommendations that may |
| 0:57.8 | or may not be seeing a huge shift when it comes to recommendations and guidelines in the |
| 1:04.1 | very near future. |
| 1:05.2 | Now, we kick off the podcast talking about this because it is so incredibly exciting and exhilarating. I still have |
| 1:12.4 | goosebumps from our conversation, just hearing about what might actually be coming in the next |
| 1:19.0 | several weeks to a month. And I kind of gave up hope at some point that there would be some |
| 1:25.7 | sort of top-down change. This protein movement |
| 1:29.3 | has really been more of a grassroots movement, a community, a cultural shift that has been |
| 1:35.2 | spurred on by incredible scientists like Dr. Don Lehman, his mentee, and my friend as well, Dr. |
| 1:41.8 | Gabriel Lyon, who is absolutely incredible, phenomenal. Now, |
| 1:46.1 | these incredible individuals, Dr. Don Lehman, Dr. Gabriel Lyon are world changers. They are changing |
| 1:52.7 | our world for the better. And it's just an incredibly exciting time to be alive. Now, on this |
| 1:58.5 | episode, we also dive into fat loss, protein timing, and |
| 2:03.2 | distribution. And I kind of changed my opinion a little bit on protein timing and |
| 2:09.7 | distribution based on my conversation with Don because it really does seem that once you're |
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