Well, we'll call that the haagen-dazs experiment and declare it a waste of a loverly afternoon.
Despite a huge crash at about 4 (and it wasn't a nice primal tired) I did get lots of stuff done. My exercise was pushing a wheelbarrel full of bags of dirt.
I managed to fix my macros by eating bacon and eggs for supper.
Eat good food. Move yourself. Lift something.
You'll be surprised how much you don't miss grain.