jtucker is completely right about one thing: Our Lord didn't multiply bleached, spongy Wonder Bread. And any time you read about a Saint or religious (monk, nun) eating a single piece of bread for the day, etc. DO NOT PICTURE A SLICE OF BUTTER-KRUST, WONDER BREAD, or any other brand of modern "white bread". Please!
It used to be that only children would picture such silly things. It was cute. But today, since we are so divorced from reality and things like farming, baking, cooking -- I'm sure there are some 30 year olds who might make that mistake now!
Has anyone besides me (and a few other ex-seminarians) experienced eating REAL BREAD? Made from scratch? The kind you have to cut with a bread knife? The texture, smell, and taste is completely different. Even the white variety is different, believe it or not!
And jtucker is also correct that modern farming methods leave the soil depleted of *trace minerals*. So vegetables aren't as good as the homegrown equivalents of yesteryear. But there is still a lot of nutrition there -- the bare minimum, as it were.
But I strongly disagree with jtucker about the "carnivore diet" thing. All things in moderation: meat, fruits, vegetables, grains, dairy. God made them all for us to eat, and man has been eating ALL of these things for MILLENNIA -- and with good result!