The one that I find interesting is that the company has to pay more health insurance for a person who has a BMI that is too high, and/or has a waist line that is larger than the given limit for the BMI.
The companies in turn send these "metabo" employees to health and diet seminars, which is quite annoying.
I do not personally have a problem with this since I am quite skinny, but I have heard strong responses from my American friends. Some of them mention "the right to be fat" :-p.