This is the worst idea ever.
Just because you can do something, doesn't mean you should.
It would be much simpler, more effective and reliable for insurance companies to have customers stop by once a year to the insurers office to be weighed, and then just charge them based on that.
Great, so now insurance companies are not allowed to discriminate against me because I'm a fatty, but they do get to discriminate against me because I prefer to sit or lie down rather than stand, or because I don't want a phone in my pocket tracking my every move. Orwellian.
Yet another project coming from Apple for the purposes of poorly dressed politics. They had best keep at arms length from whatever insurance companies want to do with this information.
Retards.
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Here is what we know: Health costs are ever increasing by big amounts, people are living longer, and more people are demanding healthcare, and even with insurance most patients can't afford to pay for major procedures.
Under those conditions the odds of healthcosts ever coming down is nill. They can shift around the cost, but shrink it? Unlikely.
They can't shrink health care costs overall.
Even if interventions like these result in meaningful changes in behavior (which they probably won't to a great extent), this overall doesn't necessarily translate into meaningfully better health for the vast majority (it won't have much effect at all), the best it can do is save insurance companies a little money. But in the end, society pays back the price and more, because a long-lived elderly population results in larger costs to society overall -- in the form of Medicare costs, Social Security, nursing home care, and a lot of other things.
There is nothing fundamentally wrong with living well and dying young.
Sure, an insurance company might succeed in saving a small amount of money (but they probably won't), but this is only possible because they get to unload their elderly customers onto society once they turn 65. Then, taxpayers eat the cost on the back end.
That's only if it works. If the interventions are overall ineffective, then you've just wasted time and money. At best, it serves as a phony, dressed up form of price discrimination that insurers can use to squeeze additional bits of money out of people, without really improving much of anything overall.