Unless you think there's something wrong with eating carbs (there isn't,) there's nothing particularly bad about rice. In fact, it's a great source of calories

Unless you think there's something wrong with eating carbs (there isn't,) there's nothing particularly bad about rice. In fact, it's a great source of calories and carbs. "Typical junk food," on the other hand, usually contains a lot more calories (and sugar/carbs and fat), sprinkled with various things that make them super-appealing. It's not impossible, but not incredibly appealing to overeat rice. Overeating a bag of Doritos on the other hand is very easy.