Ron in his monster form is obviously based on the Incredible Hulk. Both Kim Possible and Marvel are owned by Disney
Inspired by the 2004 documentary "Super Size Me" where Morgan Spurlock ate only McDonalds for an entire month as a social experiment to show the impact of the fast food industry on people's health.
The kid at Bueno Nacho who criticizes Ron's eating habits is a Make-A-Wish kid.