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Workplace wellness programs have become an $8 billion industry in the U.S. But a study published Tuesday in JAMA found they don’t cut costs for employers, reduce absenteeism or improve workers’ health.

Most large employers offer some type of wellness program — with growth fueled by incentives in the federal Affordable Care Act.

A host of studies over the years have provided conflicting results about how well they work, with some showing savings and health improvements while others say the efforts fall short.

Many studies, however, faced a number of limitations, such as failing to have a comparison group, or figuring out whether people who sign up for such

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