It's that smaller group of individuals who might be geneticallypredisposed to harboring levels of M. smithii that might put them at higher risk of developing obesity.
If your eggs are getting thawed out and fertilized in vitro, why not be certain you are getting just the child you want by choosing its sex or making sure she isn't geneticallypredisposed to, say, depression or cancer?
At the same time, I truly believe there are plenty of people in the insurance industry who wish their companies did not make a profit by excluding the woman who discovers she's geneticallypredisposed towards getting breast cancer, or by burdening the family whose child has autism with unmanageable premiums.