If you start here where do you stop?! Would you advocate for smokers to not be allowed to be nurses because that is certainly unhealthy?! How about those that drink more than recommended?! And I have no doubt that a few nurses out there are doing recreational drugs or abusing prescriptions which can be hidden for some time.
You also need to boot the anorexics and bulemics because they aren't what we want our patients to duplicate. Actually anyone underweight needs to go because that's not a good example of healthy behavior. Take out those that don't exercise either because we all know it's recommended we do so for a healthier heart, etc. None of these would be good examples for patients.
While it would be nice if all nurses (or everyone for that matter) were the perfect weight due to a perfect diet and exercising 5 days a week who didn't partake in smoking, drinking, doing drugs, purging, puking, cutting, abusing themselves in any way, etc. this isn't a realistic view. Nurses are people not robots. If we wiped out all the nurses who did anything that was a bad example and/or unhealthy there would be very few left.
And if we are going to hold nurses to these standards then we would have to hold all medical personnel dealing with patients to these standards as well, right?! Not going to happen.