In TS4 it takes DAYS for a sim to die of starvation. On top of that they eat meals at school and work (the hunger bar will get filled if they get hungry at school or work).
Also, maybe I’m misunderstanding, but TS4 have the same speed as all the previous games. In TS1 your sims died if they didn’t eat in a day or so, they didn’t eat at school/work, and they went to school/work EVERY DAY. In TS4 they occasionally pee themselves or faint, but hunger isn’t really a problem, at least it has never been for me. Even if they’re hungry just before school/work, don’t bother giving them breakfast if they still need to sleep a bit more or have to shower or something, they’ll eat at school/work. They also go to the toilet at school/work.