i used to do such fasts without any intention when i was in my 20s, related to depression... sometimes i'd eat almost nothing for days running, but it wasn't full fasting

short fasts are good but really, you will understand once you break through after 3 days and how it changes your body, it's like a really slow drug dose, if you know what i mean... when you are used to using drugs to do things to your system, it gets easier to keep doing them, and this can be unhealthy, but 3 days fasting is something you really must do at least once or twice a year 

 I already do it. After 3 days I start to feel very very happy and grateful 

 yeah, i am intensely wishing to experience that again, it's difficult to remember to not eat... i literally tend to take 2 days sorta just eventually cutting out the wine and the coffee as well, i'm just trying to see to do it the same way as led me to it last time, it took the full 3 days before it started and the first sign of it was the warmth and the acetone smell in my pee