This is a comedy, not a crime mystery (a little bit of that). It was fun to watch.
The jokes in the first half of the movie didn't make me laugh but the second part was so funny. The jokes got better and their execution was done well.

Story
The story is predictable but enjoyable. It's hard to lose weight and that was shown through the characters. They don't need to change if they don't want to.
The important thing is that they are happy, healthy and able to do their job.
Side plot was catching the thieves, nothing was ever serious and even that was done in a comedic way.
But me being me, always looking for a deeper meaning tried to guess who is the villain for half of the movie. I wanted to laugh at myself after he was revealed.
My point is that there is no deeper meaning behind the villain, just enjoy the movie.