The way it worked, I spent, I think, between a month and half and two months on a *very* restricted diet. All I could eat, erm, drink, was freshly squeezed juices. Also some plain water, a bit of salt, and some vitamin supplements. That's it. Nothing else. And the amount of juices was minimal, basically just enough glucose to keep the brain functional. As a practical matter, the juices were mostly carrot and apple, but with some variety thrown in, too.
That's pretty much what Adam talks about -- predominantly liquid sugar and not much of anything else, calorie-restricted.
The result of this n=1 was that I lost around 8-10 lbs (mostly fat, by visual examination)
Clearly, this is very much a crash diet, not a "way of eating" and not sustainable for long term. However insofar Adam wants a real-life test, here it was.