What do you think about health insurance companies charging more for overweight people?

My insurance company has just sent out questionnaires regarding BMI and the size of your waist. They have determined that anyone with a BMI (body mass index) over 30 will be charged 800.00 more on the year. This will start in September of this year. It is giving overweight people 2 months to lose weight. The BMI won’t pertain to me and my premiums, but I’m wondering where it will go from here. Will they then be allowed to do genetic testing to see if you may get breast cancer some day and require you to get a double masectomy?
Do you think this is warranted or going too far?