This, this, THIS!!!!!! This little blurb should be a sticky unto itself... I agree 1 million percent on all points.
LOL
Negative calorie or not, that's not fasting mate. It's not just about the calories, it's about the other metabolic functions that happen when you ingest food. You'd be cheating yourself if you didn't do an all out fast. Trust me, you will NOT be hungry. I have a ridiculous appetite, and I was amazed at how NOT hungry I was. I always started to get hungry within the last hour or 2 of the fast, but that just makes meal 1 THAT much sweeter and rewarding. You will literally be able to feel the endorphin rush when you eat... and you will be aware of your body feeling better, minute by minute. At least that's the sensation I had, particularly in the first week or so.
Even Martin from leangains admits that he reluctantly allows BCAA's prior to training, because it's not technically fasting. Granted BCAA's may contain a few calories vs. negative calorie greens, but again, it's about more than just calories.
If you find yourself having a tough time dealing with the hunger, fill up on water. Give the diet a chance to work it's magic!
