Should We Have a Fat Tax?

Dave at the Crisper has a href=""an interesting post /aon the possibility of taxing those with a high BMI (Body Mass Index). Should we also consider a tax on crappy genetics or how about just plain bad luck? Because hey, my a href=""BMI /ais 20 and I'm not doing so good in the health department. Could it just be that some people find fat people offensive? I wonder how far the food Nazis are willing to go so that they do not have to bear the unsightliness of the overweight?