Help. My girlfriend and I moved to Chattanooga, TN from Miami?

My question is, why is everyone so obese especially here in the suburbs (Hixon) where we live? Every time we go to the mall, there's nothing but big big bellies everywhere. Some people are so large that they have to ride in electric carts because they can't walk very far. I get so sad I just want to help these people. I wish that they could know what they are doing to their bodies when they are pigging out at the Olive Garden and Golden Corral :(