Didi Wanna Be a Kid (2004)

Didi works at a traditional candy factory, which faces serious problems with the competition of a big company, whose products are full of artifical and dangerous flavors and colorants. He tries to warn the kids of the danger, but they don't believe him, and he prays to his saints of devotion, St. Cosmas and St. Damian, for a solution. Some other day, he gives shelter to two poor men who, in return, give him some magical candies. After eating them, he turns into a kid and tries again to talk to the other children, who now take him seriously, since he has become one of them.

Unfortunately the movie Didi Wanna Be a Kid is not yet available on HBO Max.