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Some Work, All Play

281. The Facts on Lead in Protein Powder, 22 Hot Topics in Endurance Sports, Weird Science of MRI Findings, and Increasing Carbs!

Some Work, All Play

David Roche and Megan Roche

Running, Sports

4.82.1K Ratings

🗓️ 21 October 2025

⏱️ 86 minutes

🧾️ Download transcript

Summary

We loved recording this episode! The main topic was the article that rocked the athletic world last week, which asserted that many protein powders had unsafe amounts of lead contamination. We broke down the numbers to reach a much more nuanced conclusion that should help you feel better about it all. And that led to a broader discussion on the perils of advocacy being presented as science. 

We also talked about a shocking study on 45 asymptomatic people, which found labrum defects in 69% of hips! MRIs are complicated, unveiling mysteries of the human body and the strange line between structural and inflammatory issues. We discuss what it all means!

And this one was full of great topics! Other topics: recovery cake, Megan’s beastly bike workout, our attempt to program AI with 22 sexy concepts in athletics, a study on actual v. planned carb intake in races, Courtney Dauwalter doing another marathon, a hypothetical about Cole Hocker in ultras, breaking up moderate running with sub-threshold intervals, how grief impacts training, energy deficits in multi-day events, preparing for heat, period parties, and when to FAFO.

We love you all! HUZZAH!

Prepare for some shockingly high-grade fish,

-David and Megan

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Transcript

Click on a timestamp to play from that location

0:00.0

Woo! Welcome to the Some Work All Play podcast. We are so happy to do with you today. Happy Tuesday. It's Tuesday. And we're celebrating Cake Week on this Tuesday. Cake Week. I think I know what you're talking about because we have a massive cake in our fridge. Two kinds of cake in our fridge. And cake week is where you go to town on a cake in the fridge, just with a fork. And I feel like it leads to some big adventures ahead. It's the best thing I've ever seen because this cake is not a normal cake. It is at least eight inches high. The container. It takes up most of our fridge. I think that should be the main way to maintain like energy surpluses is just massive sheet cakes in the fridge. And it's perfect. It's Tuesday. Actually, it's Monday here. We always record up Mondays. And we got some big adventures ahead. And I feel like what better

0:41.3

way to prepare it than going at cake with a fork. Yeah. So there's big adventures ahead. You keep mentioning that. Potentially. Potentially. Undisclosed big adventures. Yeah. Stealth mode big adventures. sorry yeah yeah no I mean I know I know what you're talking about because Leo is potty training

0:56.8

oh yeah exactly We have some big adventures in cleaning the floor. Those are the big adventures. I had to bring it up, though, because cake was just so important. I was like, how do I talk about cake and not talk about undisclosed big adventures? I understand. We have this big principle that like, you know, we don't really talk about races in advance anymore too often, you know? I mean, a little bit. We refer to them. But then cake comes up. And it's like, whatever rules you have in your relationship, throwing out the window because this is our like massive cakes with tons of frosting. It's like that's the most important thing we have going on. It is so important that I feel like it overpowers. I feel like we don't do that because sometimes it's like we, I feel like the way that we put ourselves out there, it can be easy to form narratives in the head before you go to race and or go to any sort of big undisclosed defender. We'll call it that. And I feel like cake just overpowers those narratives to the point that it's okay to talk about. Yeah. You know what my narrative is? What? To quote Rihanna, cake. Cake. Okay, let's get on the episode. We have a great one today. First, we're going to start with some wild science on hip injuries and MRIs generally. Then our list of sexy things in exercise physiology. You did that. So you didn't have to talk about your life this week. You're like, I'm just going to make a long list of sexy things.

2:03.0

And you know what?

2:03.5

I love it.

2:04.3

Okay.

2:15.7

And it's might need to be like a new podcast segment. Yeah, we'll see. A discussion of the article on lead contamination and protein powder that rocked the Endurance World last week. We have a lot of science there that will make you feel way, way better about it.

2:34.5

A study on shockingly low carbon-taken races, and then a Q&A on a coal-hawker hypothetical, study in moderate running, grief in how that affects training, energy deficits, preparing for heat, and lots more. There's a lot of good science on this episode coming ahead. I'm excited to talk about the lead and protein powder study because I have been, not even a study, actually more report and I've gotten so many questions about it so many I mean on Patreon alone I think we got like

2:40.1

three dozen people just being like what are your thoughts and even for me I was horrified when I saw

2:46.8

the headline and then I dug into it punched some numbers, and I feel way better about

2:51.8

my life. I feel like not only did we dig into it, we like went excavating it. We were like digging

2:56.2

down into every little sentence. Yeah. And spent a lot of time just like going down the rabbit

3:00.7

hole of like consumer reports and like California Prop 65. And old nature articles on lead and food.

3:26.5

I mean, I think it's really comforting and at the same time a little bit scary for other reasons. But we'll get to that soon. What I wanted to start with, actually, was last week you were doing a bike-focused week for a reason we'll get to in a minute. And we were downstairs in our pain cave. And you're doing your first work on the Zwift ride in quite a while. And we set up

3:25.2

a really cool workout design where you went to the steepest hill in Zwift called the Radio Tower

3:29.4

climb and you were going to do repeats of it. And it was actually, I was very excited. It was like,

3:33.5

it was excited for it to be fun. And then I got into the workout and I was like, bike threshold is

3:38.3

so much spicier than run threshold. It's a good thing.

3:40.9

Like, we were downstairs together.

3:41.8

It was a pain cave date.

3:42.8

And I was like, I'm just feeling spicy over here. Yeah. Well, the mechanical demand of biking is so high, like the muscular demand. That's why it's a great muscular endurance stimulus. And we theorize that cycling is so great for runners because of that. but seeing you out there grinding was awesome and just so inspiring as I was on the treadmill doing my zone two work. And what I wanted to point out, though, is that you were a sociopath freak. Why? Was it because I was out there grinding? Was that a DJ Collead reference? So I just looked to my left as you were doing this workout periodically. And you're just dripping sweat, looking straight down, not even at the screen, just looking at your legs, like just watching the pistons go back and forth.

4:18.4

The whole time, you barely getting out of the saddle.

...

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