Bernie Fishbine is overweight. He goes to the neighborhood store every day to buy chocolate candy kisses. One day while buying his kisses, he meets Theresa Garabaldi. They start to develop a relationship as they take the same bus route every evening. Theresa invites Bernie to see her play piano at her father's restaurant. She convinces him to join a gym. Theresa is a college student and comes up with the idea to use Bernie's weight problem as the subject for her thesis, only she fails to tell Bernie about her plan. Meanwhile, Bernie is falling in love with Theresa, and vice versa.