This pair of videos give you an idea of how much work it takes growing wheat for flour… not to mention the extra work that goes into baking bread:
Now try doing this without all the modern tools and imagine what would go into feeding yourself a grain-based diet. Sure… I like to grow grains, just because I’m a plant lover… but in terms of feeding myself, forget it.
The only reason we can eat as much grain as we do is because modern agriculture has turned grain production into a science… and their efforts are heavily subsidized by government.
Why start growing wheat for flour when you can be raising chickens for eggs?
On a small scale, and for optimal health – primal/paleo is the way to go.
The work and the health aspects are why I love food forests so much.