I've been fasting on alternate days for almost 2 months, limiting myself to 500cal on fasting days. I've stopped last week for a similar reason as why I've stopped bi-phasic sleeping schedule - both are incredibly fragile systems.

Under controlled enviroment, both worked incredibly well. I was stabilizing my weight, had increased energy, reduced mental load, general well-being (however quantifiable is that)... But once you miss that afternoon nap, or take those 500cal in the form of beers, everything breaks down. Something as simple as a doorbell at the wrong time destabilizes you for at least a day.

As to particulars of what I ate during that diet, I think that's to a large extent metabolism-specific (all nutrition is, imho), so you'll have to figure it out yourself.