I think the main thing I've learned is to be a better steward of all the life, plants and animals, that God has given us. I waste way less food than I did before. I realized all the labor and money that went into every plant. We butchered our rooster this year and ate the meat. Butchering our own chicken helped me to be more conscious where the meat comes from and I think I naturally started to eat less meat in general. (Someday I hope to do more meat chickens but our current location won't allow for it)
Another bonus of eating our own veggies only has been savings on the grocery bill. We are consistently saving $700 a month from last years average grocery bill. That is no exaggeration. Even though using our own vegetables helped us lower the spending, going to the store less (twice a month) was a major savings. We didn't have a chance to impulse buy. The other thing that came out of eating homegrown food is I cook way more from scratch and that cut down the grocery budget as well.