Feed it while it is full
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just feed them constantly
Don't let your sims exercise, and make sure they eat a lot. You can also make them fat while you are in create-a-sim. (Hint: while you are in create-a-sim press shift and n. It will give your more options. You can even make your sim a grim reaper!) Hope This Helped! :-)
Make your your sim eat lots of snacks and deserts, even when they're not hungry. Also, don't let them do physical activity (exercising, yoga, sports), make them sit all day on the couch and watch TV all day. P.S. Make them get fat asses! Feed your sim loads of junk food when they are not hungry works, then once they have finished eating let them stand still for a while and they should get fatter!
No because in the beginning you choose if your sim wants to be either fat, skinny, or medium (fat and skinny)
In Sims 2, for the PC, a Sim can get thin by working out. If you want to get a Sim thinner, go to you desired Sim's neighborhood and press ctrl + shift + c (this will make a cheat box appear). Once the cheat box has appeared type (as seen) boolProp testingCheatsEnabled true. Now go to your Sim's house. Right click on the Sim you want to make thinner. Now press 'change fit' and 'thin'. This cheat code will also allow you to make your Sim fat and do a variety of different things with them