Yes, I have. I have a hard time with it, because I really like veggies. Still, I don't think there's anything magical nutrition-wise about eggs. Fatty cuts of meat should contain all the same things.

If you're going to fast on meat exclusively, though, it's very important (IMO) that you use fatty cuts and eat the fat as well as the lean part. That way you won't be shortchanging yourself on essential fatty acids and fat-soluable vitamins.