The following foods will change your job. Note: The first eleven foods will give a random benefit but will not change your job.

HR Bentous: Makes you a Slugger.
Makunouchi Bentous: Makes you a Rakugo Performer.
Picnic Baskets: Makes you a Kana.
Rice Ball: Makes you a Carpenter.
Sandwiches: Makes you a DJ.
Squid Ink Bentous: Makes you a Man In Black.
Steaks: Makes you a Mika.
Sushi: Makes you a Sushi Chef.
Tempura Bentous: Makes you a Diver.
Vegetarian food: Makes you a Komuso Monk.