Okay, don't worry, I only noticed the extra afterwards. Like all "extras," I only thought something would be available there after finishing the game. One question: what happens when we reach 99% or 100%?
When your town hits the 99% obesity mark, it'll be considered 'obesified', and you'll unlock the New Game Plus mode that lets you travel to a fresh town. Each time you do this, the national obesity rate increases, which will make new towns fatter to begin with and will change the news reports. I'll be expanding on this system a lot more in a future update.