What we're seeing is employers who are trying to find out people who might be sick in the future, who might run up the company's medical bills, and (efforts) to screen them out, even though the company knows they can do the job perfectly well.
This could be the first step down a very dangerous road. Do we really want to live in a world where employers penalize us for everything in our private lives that isn't healthy?
You can't help but sympathize with an employer who's trying to improve the bottom line, but allowing employers to take over everyone's private life to improve the bottom line is just not legitimate.