Dr. Peter Attia

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5,258 appearances 36 recordings 6 series first heard Jan 2024 last heard Jun 2025

Dr. Peter Attia’s voice in public audio — every appearance, attributed to the second.

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The Diary Of A CEO with Steven Bartlett · Anti-Aging Expert (Peter Attia): Anti-aging Cure No One Talks About! 50% Chance You’ll Die In A Year If This Happens! Boost Testosterone Naturally Without TRT! · 7 Apr 2025 podcast

So this is a study that looked at older individuals, and it randomized one group to a significant amount of exercise, and the other group was just sort of business as usual, being largely sedentary.

And then using pretty elaborate techniques where you biopsy the muscle, they look at the mitochondria, which are kind of the powerhouse of the cell, in these individuals, and it turned out that in the people who were exercising, there was very little decline in the mitochondrial function compared to what happened in the people who were not exercising.

Now, just because your mitochondria continue to function well doesn't mean all aspects of aging are offset, but it's a very important one to demonstrate. And this is also true by the way of strength and endurance. There's a big difference in the rate of decline of muscle mass, muscle strength, and cardiopulmonary fitness in people who exercise versus who don't.

So it's all kind of a long-winded way of saying you have, as an individual, so much more under your control than you realize. But you have to sort of begin to compounding the gains. I'll do it when I'm 50. Well, look, the good news is 50 isn't too old. And I've met many people who don't begin to do this until they're 50. But again, the analogy I would use here is 50.

comparable to that of investing for retirement. The longer you wait, the less money you're probably going to have at the end.

The sooner you start, the better. The drawback that young people have is... I mean, you've had a great experience because you're introspective about it and you've been able to observe it in somebody older. So you've been able to gather motivation without having to experience the decline yourself. So that's a wonderful position to be in. For many people, that's not the case.

They only begin to realize the inevitability of the decline when it besets them. But the way to think about this, again, is another analogy, is that of a glider. So gliders eventually all have to come down, right? Our health span is basically a glider, but we have a lot of control about how long it stays in the air based on how high we can start it.

So if you think about, you know, would you rather take a glider off a really high cliff or off a low cliff, that's the decision we get to make. And we sort of call that concept physiologic headroom. So the example you gave is a great one, right? So muscle mass, muscle strength provide an enormous amount of physiologic headroom as does cardiopulmonary fitness.

It wouldn't have been much about exercise. It would have been more about other aspects of life, for sure. Because for whatever reason, I've always gravitated towards exercise. That's always been a very high priority for me. So I think my advice to 32-year-old Peter would be much more about relationships and emotional health.

But if I could go back and speak to 14-year-old Peter, A, he wouldn't have listened. But I would have begged him to go a little bit easier on his body and back off on certain things that probably have led to injuries I have today that could have been prevented. Can I ask what those certain things are? Sure.

I think I lifted far too heavy, far too often, and probably without enough coaching on technique. And so, you know, by the time I was 27, I had a devastating back injury. But it's one of those things that happened without any incident, right? Which is often the case, by the way, for a back injury. When you really blow out a disc in your back, it's not necessarily something you did in that moment.

It's usually something that's been built up from the past. So this injury I had at the age of 27 really was the result of years of... unnecessarily heavy axial loading, loading done with probably insufficient technique, you know, or technique that was at times sloppy and under fatigue, because I used to do a lot under fatigue, you know, I sort of believed in training under a lot of fatigue.

And I think that that's a mistake. I think that training under very heavy load should not be done under great fatigue. Interesting. We'll talk about that as well.

And does it matter? Well, I think the second question is easier to answer than the first. I do think it matters. The why is probably multifactorial, and the why is just as important as the fact that it is. In other words, the fact that it's declining is both relevant for the fact that a very, very important hormone that has –

incredible benefit to men and women by the way is going down and we have to come up with an answer to that right like so how do we address that do we address it medically where we replace that hormone exogenously meaning we give you that hormone directly or do we try to fix the underlying problem so if you want to do the latter you have to know what the underlying problem is now at the population level the best answer as to why testosterone levels are declining

And unmistakably, they are. So the data here are unambiguous. There's no debate on this fact. The debate is around the why. I believe that the best answer probably has to do with two things. One is increase in body weight and body fat specifically in men. and some combination of reduced quality of sleep and sort of disruption to sleep. So why are those two things relevant?

So when you increase body fat, two things are happening. One is you're increasing inflammation and you are reducing the amount of testosterone that gets to stay in the form of testosterone because part of the testosterone gets converted into estrogen. So with body fat comes more of this process called aromatization or converting testosterone into estrogen.

So if you think about what those two things are doing, if you have more inflammation, that reduces your ability to make testosterone, and you have more capacity to turn the less testosterone you make into estrogen, the net result of that is both of those things are reducing your total pool of testosterone.

If you couple that with lower quality sleep, and I'm not talking about over the last three years. I'm comparing like now to say 40 years ago. And what are all the reasons that people might have poorer quality of sleep now? I think there were many, but obviously phones and social media and just the stimulation of the world we live in probably plays a greater role in that.

Sleep is when we make these hormones, right? So we make follicle-stimulating hormone and luteinizing hormone at their maximum amount during sleep, and those are the hormones that are driving the production of testosterone.

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