Sims that are at work that are starving automatically have their needs filled by the game
If you have a large garden it can take a full day, or more, to tend to all the plants. Some mods to help, which you will need to register at the site to see and download, are:
https://simsasylum.com/tfm/index.ph...d-june-20-2014/
there is a no hygiene decay version, read all the versions to get the right one as you can have only one
But you might find this one is better, a faster gardening mod, which may solve your issue with the time it's taking
https://simsasylum.com/tfm/index.ph...d-june-17-2014/
You can only have one and there could be others on that site if you look. These two have worked well for me with large gardens.