QOD

QOD is the only formalized version of ADF I have found and actually is how i first heard about ADF. Based on the peer-reviewed science I am not sure about how necessary the calories, protein and non-protein calories, etc are, but for some, I imagine that eating something makes the whole lifestyle easier and these then may be be good rules to follow. I personally try to fast (tea, water, maybe a diet redbull) on my fast days and if i really breakdown i just aim to be under 400 calories, no matter what those 500 calories are.

from eatQod.com

From the website: The QOD Diet™: Eating QOD is a way to lose weight gradually without pushing your body into starvation mode.Eating QOD allows you to eat pretty much what you want (within reason and without binging) every other day (ON days), so you don’t need to feel deprived. In between, during the OFF days, you need to limit food intake to 300-400 nonprotein calories, plus about 200 calories from protein, but your mineral intake (sodium, potassium, and calcium) should be kept constant.