Fitbit claims its users cost their employers a lot less in health care — here’s why that study is flawed

People who used Fitbits cost their employer nearly 25 percent less in health care costs, according to a new study from Fitbit. At first blush this appears to be a tantalizing result for companies looking to save money, but a closer look shows that gains aren’t as dramatic as they appear.Here’s the claim: Fitbit says that employees at a large company cost almost $1,300 less to employers when they used a Fitbit for two years. These numbers look great, but there are flaws in how the stu