Steven Sinofsky argues wearable health metrics are inconsistent, while Bryan Johnson defends single-device relative tracking

I wouldn't worry about this. Wearables are valuable for their relative tracking.

They help you compare yesterday to today and learn things like how your sleep changes when you drink alcohol before bed.

A device that is consistent is reliable. It reproduces its own reading from the same conditions. The most commonly worn wearables are sufficiently reliable to make relative measurement useful.

There are many engineering, data analysis, and algorithm reasons why two brands generate different numbers but that doesn't really change the value much. It's helping people develop intuitions about what helps or hurts their health.

@bryan_johnson I agree. That said, once you've worn it enough and have gotten your trends, the constant influx of data can become a nuisance.

Know your numbers, but don't feel like you need to be handcuffed to a device that gives you an estimate of how you should perform for the day.

@bryan_johnson Is this safe to wear them throughout entire day and night? Is not harmful at the scale we are using and sensor monitoring almost every time?

@K54321000001 @bryan_johnson But I don’t wear them 😂

@bryan_johnson What do you think about keeping cellular and bluetooth devices close to your body, AirPods for example ?

@bryan_johnson Everyone should try out a glucose monitor for a month- one of the best decisions I made.

@bryan_johnson as @MKBHD said, it they are consistently wrong its right

I'm consistently going wearableless for most days now and it feels great. When I do similar workouts to my past ones, I pre-fill the HR data from that past workout so don't need to even have the watch/whoop on. It is close enough and it's the work that matters anyway.

Like this 1h pullup workout is same intensity as the same workout I did last week so I just copied it. Empty wrists.

@bryan_johnson Agreed. Plus they take months to calibrate. All these reviewers wear it for a few days and make grand assumptions.

@bryan_johnson One day, the weight carried for years will feel lighter than the wisdom it gave.

@bryan_johnson Anyone who isn't on the fringe of self-health and wellness already knows this.

This kind of post from Dan, gatekeeps those who aren't sure if they should get into these kinds of things (and their wellness journey) to begin with.

@bryan_johnson Mr. Johnson you’ve done so many tests but I’ve seen very little about the impact EMFs might have on our health and longevity.

Any thoughts on the dangers ?

@bryan_johnson How's all that nnemf working for you? Blasting yourself constantly, maybe that's why you have to spend so much money on supplements. You realized astro turf was bad. Wonder when you'll treat emfs the same as plastics.

@bryan_johnson None show u the methodology transparently. So I just build my own and keep learning.

@bryan_johnson Agreed. I don’t put a lot of value into the exact numbers reported by my wearable, but I do gain insight from knowing where I am relative to my baseline.

@stevesi Same. Feels like reading tea leaves with tech.

@bryan_johnson Any fixed number related to biology tends to be fake and inaccurate so they only end up being useful in aggregate to see what changes over time

@bryan_johnson True

@bryan_johnson I've stopped caring about the exact number, the sleep-after-drinks hit shows up every time.

@bryan_johnson who cares if the numbers differ. i just need to know if i slept like garbage lol