Apparently, it's just a ploy to call attention to obesity in Mississippi. There's no way/desire to really enforce such a law.
http://www.msnbc.msn.com/id/22997073/
*snip*
JACKSON, Miss. - A state lawmaker wants to ban restaurants from serving food to obese customers — but please, don’t be offended.
He says he never even expected his plan to become law.
“I was trying to shed a little light on the number one problem in Mississippi,” said Republican Rep. John Read of Gautier, who acknowledges that at 5-foot-11 and 230 pounds, he’d probably have a tough time under his own bill.