2 days, no protein foods...
I stuffed myself at a Brazilian style meat bbq last sat then was 'forced' to eat a huge amount of seafood the next lunchtime, after that protein fest i decided to not eat any protein foods the next day, in fact i went 2 days without my usual 3 meals of +40g protein from meat, fish, eggs.
It was surprisingly easy as these are usually the things i crave and strive to chow down. I ate lots of veg, olive oil, avos, fish oil, and fruit however, so not exactly fasting, i was probably still in calorie deficite though.
Hopefully this protein cycling is useful and improve overall protein utilisation(pure speculation)...ABCDE diet like perhaps for those who have been around a while...