Another effect of not pushing people to achieve a certain weight or look a certain way is that most FatLanders do not keep a lot of anger hidden inside. (With a few exceptions, several of which are mentioned in FatLand 1.) Of course, considering the FatLand safety net and training programs, no one goes hungry and no one is stigmatized during their training periods. As a matter of fact, it is considered completely natural for people to undergo training at least twice in their lives, and no one thinks twice about it.
All this adds up to precious little reason to have jails.
If FatLanders do not behave as they should in public (mostly drunkenness and slight amounts of rowdiness), they are visited by a FatLand constable accompanied by a therapist. If this happens again (and it almost never does), they must stay home and send a written apology to the people they affected or hurt and pay a fine.. Third time: exile. From FatLand. Yep.
And that is one of the main reasons that FatLand does not need jails, and that their crime rate is so very low.