Surely an indefinite fast will get you pretty slimmed down…
Just saying about what I recalled from the website, and, of course, not wanting to see anyone actually starving themselves.
I also believe that if one were to fast / attempt to fast for a long time, then the body is most likely to down-regulate the metabolism, sometimes referred to as Famine mode. Don’t overlook also that to meet the body’s need for some carbohydrates, it will, if necessary, start Gluconeogenisis.
I’d be interested to read about how those who are going to give this a go, get along.