Peeps eat about 200 food per day per person. You buy food in the store, I recommend the organics grains once you have enough money. 1 pack of standard food gets you 150 units, 1 pack of organics gets you 250 units. They will eat on their own overnight but if they are very hungry just drag someone 14 or up onto the table/stove to have them start "preparing a meal." Then, drag the peeps onto the completed meals to have them eat.
Welcome to the LDW forums Trent! Happy playing with VF! If you need any help with anything else just ask
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if they're starving and REALLY need to eat, buy them some candy/fruit from the store. Have them fix meals as soon as possible if that happens, but if they're on the brink of death from starvation, get them candy/fruit immediately from the store. If there isn't any, the store restocks every 4 hours. Candy and fruit reinforce behaviors, though, so make sure they're doing something good when you give it to them (studying, preparing a meal, working on career, etc)