I know this is an old post but i have started having this exact problem today.
I played through 4 days. On days 1-3, they were able to eat just fine. On the 4th is when the problem started.
They can get quick meals just fine and the vampire can get plasma packs.
This only happened on their home lot. When on their business lot, they are able to get and eat prepared meals from the break room fridge.
I loaded into another lot and the sim was able to eat as well.
I have moved my family to a new lot but have not yet been able to test.
I have no mods installed and no cc.
I just tested the same famil on a new lot. In different houses, including their original one. They are still unable to get prepared meals. They reset every time regardless of whether the meal is on a counter or in the fridge.
Thanks! I'll give that a try the next time i'm able to play
