I don't think there's a whole lot of mystery that goes into this. Protein not too high, carbs fairly low, what little calories largely from fat. Most of the difference between a fast and feeding metabolically is the difference between metabolizing exogenous vs. endogenous fuels--the more of your fuel is coming from fat, the more you're mimicking fasting. The protocol likely doesn't depend on what's been left in (nuts, green veggies etc.) as it depends on how little has been left in for the period of the "fast."

They are somewhat secretive about the ProLon package, but my understanding is that it is basically fat free with the 500 calories from protein and carbs .