Sarcopenia After 40: Dr. William Evans on Muscle and Aging

Well Beyond 40

JJ Virgin

Fitness, Health & Fitness, Nutrition

4.5 • 1K Ratings

🗓️ 4 February 2026

⏱️ 56 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

In your later decades, how can strength training reverse muscle loss? In this episode, I spoke with Dr. William Evans, the scientist who first described sarcopenia, to unpack why muscle loss—not aging itself—is the biggest threat to metabolism, independence, and long-term health. We explored why muscle is far more adaptable than most women realize, even into advanced age, and why traditional measurements like scale weight and lean mass miss the real picture. Dr. William Evans is a muscle researcher, former pharma scientist, and a professor at the University of California, Berkeley, whose work has been cited over 80,000 times. If you’ve ever heard that muscle loss drives aging, chances are it traces back to his research. What you’ll learn: (04:33) How losing muscle directly lowers metabolic rate and increases disease risk. (06:49) Why common body composition tests fail to measure true muscle mass. (07:31) How a new non-invasive muscle test predicts strength, disability, and longevity. (13:32) Why muscle percentage is more predictive than body weight or BMI. (20:55) How neurological changes and inactivity contribute to muscle loss after 30. (23:37) Why strength and power training are essential for preserving fast-twitch fibers. (30:49) How protein intake and resistance training protect muscle during weight loss. Love the podcast? Here’s what to do: Subscribe to the podcast. Leave a review. Text a screenshot to me at 813-565-2627 and wait for a personal reply because your voice is so important to me. Want to listen to the show completely ad-free? Go to http://subscribetojj.com Click “TRY FREE” and start your ad-free journey today! When you’re ready, enjoy the VIP experience for just $4.99 per month or $49.99 per year (save 17%!) Full show notes (including all links mentioned): https://jjvirgin.com/drevans Learn more about your ad choices. Visit megaphone.fm/adchoices

Transcript

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0:00.0	Life's full of big money decisions. Dividend versus growth stocks, tapping home equity, even navigating tariffs.
0:06.9	And for every smart tip out there, there's another one that sounds smart but isn't.
0:11.1	That's where NerdWallet's Smart Money podcast comes in. I'm Sean Piles, a certified financial planner professional.
0:16.6	And I'm Elizabeth Ayola. On NerdWallet Smart Money podcast, our finance journalists do the homework
0:21.5	so you can make confident wealth building moves. Whether you're building your portfolio or protecting
0:26.4	it, we've got the facts and a little fun along the way. Follow NerdWallet Smart Money podcast
0:30.9	on your favorite podcast app. Most people think aging is just what happens to you. But after 40,
0:41.1	aging actually is losing the one tissue that protects your metabolism, your brain, and your independence. And I'm talking about muscle.
0:46.5	And today's guest, Dr. Bill Evans, is the scientist who discovered circopenia. That is that
0:52.2	loss of muscle mass with aging and what he's found
0:56.1	lately is going to change everything that we know about aging literally this
1:02.0	episode is going to help rewire how you think about your future self and what
1:06.0	is possible you're going to know that you are not fragile that your muscles
1:09.3	are adaptable literally in your 90s, yes.
1:14.2	And we'll talk about new research on natural mylostatin regulators, including my favorite
1:20.0	fortitropin and why they might be the next frontier.
1:23.1	I'll share my story with fortitropin.
1:24.8	This is the yolk product, and we will make sure that we put into
1:28.6	the show notes how you can get your hands on some too. This is a product I'm obsessed with and so
1:34.3	much so that I now work with the company. So I will be right back with Dr. Bill Evans, adjunct professor
1:40.4	over at UC Berkeley in the Department of Human Nutrition and Nutritional Sciences
1:45.8	and also over at Duke University, he is also working there as well. And this is a massive
	...

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