*shrug* if you want to...
Do eggs count?
If my family wanted to do meatless mondays, I'd probably just IF. I mean... I love veggies so I could do a day of veg, but I don't see the point.
Grok probably had days where only berries, roots, greens and grubs were available. He probably wasn't thrilled about it though.
Wouldn't his energy levels be pretty low, because he would have been totally fat adapted?