Berries are fantastic before you can start proper automation. As soon as you do, there are other food sources that are by far superior. Apples from an MFR tree farm, or chickens from a chicken farm (you can even make automatic grilled chicken factory without ever touching a mod) would probably be the easiest and quickest to set up that I can think of right of the bat. Might have missed some though.
But simply making a few chickens on hoppers shooting the eggs back in will have you at 50 chickens at no time, which means you'll have 300-600 eggs per hour, which means an average of roughly 60 baby chickens per hour, which means basically 60 fried chicken per hour. Easy, stacks well, gives a lot of saturation. And this is without mods.