A read-write wearable both reads your body and writes back to it by delivering an intervention.

Now a new generation of devices is trying to do something the read-only wearable never could, talk back to the body.

The move from read-only tracking to closed-loop intervention is not a marketing tweak. It changes what a wearable is for.

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Wearables can offer rough information about a person’s health, experts say, but only some metrics are medically useful.