Mario's favorite food is Japanese-style tomato spaghetti, while his least favorite food is shiitake mushrooms.
In Mario & Luigi: Bowser's Inside Story and its remake, Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, meat appears in the forms of Hot Drumsticks, Fiery Drumsticks, and TNT Drumsticks, which can be consumed by Bowser to restore his HP.