The Nutty Professor (1996) on Netflix

Sherman Klump (Eddie Murphy) is a brilliant and a very fat man. One day he meets a beautiful and charming woman named Carla Purty (Jada Pinkett), and he falls in love with her. He aware to the fact, though, that he is a clumsy fat guy, while she is a young gorgeous lady. This makes his depressed, but just until he finds the solution for his problem. He decides to drink a potion which he invented himself in his lab. The potion makes him look very good, and behave romantically. The new him, named Buddy Love, is the perfect solution for Klump, in his opinion. But is that what Carla really wants?