Actually I was afraid of being in a protein deficit until I read this book "Way of the peaceful warrior". It's where I found out that you can fast for a week and still be good at sports. Since then I did one-day fasts and felt awesome the day afterwards. The most I went without food was 3 days, but I'll attempt at some point a 7 days fast. Benefits are great for the mind as well, not only the digestive system and sensitivity to insulin afterwards. Usually the third and fourth days are the hardest, I never passed the third, hoping to get that discipline level some day.
“The thing women have yet to learn is nobody gives you power. You just take it. ” - Roseanne Barr