You do need to be careful especially about your proteins. Since I had started the "cookie" diet after about a week my body went into a kind of "shock" in a way. I was at work and I was having very weird symptoms and found out it was lack of protein. So after 2 weeks I've stopped for two weeks and will start again but with some adjustments. You have to make it right for you.(oh yea...and my Dr. knows I'm doing this)
I also found out at my last Dr.'s apt that I'm anemic and have low potassium levels so my doc is helping me get those levels up before my surgery.
You don't want to jeopordize your surgery...so be careful if you do this.