Muscle power—your ability to generate force quickly—is one of the strongest predictors of longevity, even more so than being lean. This is sometimes referred to as the 'fat but powerful' paradox.
In a recent study, older adults with normal and high levels of relative muscle power had better 9-year survival than older adults with low muscle power.
Muscle power was even protective against death in older adults with high levels of body fatness measured using BMI and waist circumference.
Being fat and powerful reduced mortality just as much as being lean and powerful—by 43–45%.
Being lean and weak, however, provided no survival advantage compared to being fat and weak.
Interestingly, when body fatness was measured using body fat percentage or the fat index (body fat % normalized to height), the protective effect of muscle power was mitigated—only lean and powerful participants experienced a mortality benefit.
This highlights the continued importance of minimizing excess adiposity for long-term health, even when physical fitness is optimized.
The takeaway here isn’t to downplay the risks of obesity for longevity—maintaining a healthy weight is still critical. But fitness, particularly muscle power, deserves more attention as a key lever we can pull to improve both lifespan and healthspan. It’s one of the most actionable metrics to track and improve.
If you want to know more about muscle power for longevity and how to improve it, I’ll cover it in this week’s newsletter.
Study - PMID: 38523229
@BrianSuttererMD FWIW he did own up to this mistake publically and post a correction. It takes courage to put content out there for scrutiny (as you do yourself) and even more to admit mistakes. He’s certainly not perfect but he has driven a lot of interest in self improvement and health
We CT scanned an Apple Vision Pro! We also scanned two Meta headsets. Here’s what we found inside, and what it says about the two companies’ approach to AR/VR and to hardware development in general. 🧵
Education will never be the same.
People are finding some incredible use cases with Apple Vision Pro and spatial computing.
10 wild use cases:
1. Learning how heart works
@cwiggs5@DrMJoyner Thank you @cwiggs5 and @DrMJoyner for all the crucial support along the way, so incredibly excited for this next step in the journey!!😆
@Apple Vision Pro x @Sirona_Medical .
For radiologists to live in the same dimensional space as their data, the entire radiology IT stack needed to be rebuilt from scratch - for the age of AI, and the age of spacial computing.
This means one, unified, cloud-native workflow platform.
That's what Sirona has done, and as this video (of me messing around this morning in my kitchen) demonstrates, the combination of SIRONA+LLM-DRIVEN COMMANDS + SPACIAL COMPUTING is the coolest thing in imaging IT period.
Now imagine if computer vision + eye-tracking could drive the whole workflow - you could look at something, have all the data about that something display, speak without taking your eyes off the images...😎
To our team who's been building towards this (with hacky eye tracking demos going back to 2020), congratulations. The future is going to be so much fun.