Maybe when you reach a position at Dizzy's or if you romanticize your boss or fatten them enough,then you can purchase upgrades like the ones for the donut shop.
Will we get more upgrades at Dizzy's and a cool upgrade would be for when you get the national obesity at 99%,you would be able to get a paid house and a paid trip to the next country that you would spread Dizzy's influence in,you would be able to chose the house.