I decided to fast for Ramadan one year. I'm not religious, I just wondered what it was like. I knew it was dawn to dusk fasting, but didn't know that you can't drink anything either. I did an obstacle race with my son on weekend in 25 degree Celsius weather and it was very, very tough.
Anyway, I'm not sure there is such a thing as "normal" fasting. 😄
It sounds so dangerous. Not eating breakfast or lunch and having a big dinner is one thing, but literally eating nothing for 3 days? Talk to a doctor first.