I really appreciate some of the detailed comments here, but I will caution people that if you have a serious medical condition you may find fasting is a lot har

I really appreciate some of the detailed comments here, but I will caution people that if you have a serious medical condition you may find fasting is a lot harder on you than the above suggests it will be. If it benefits you, it may get easier over time. I have a serious medical condition. I used to routinely throw up when I was even just underfed for one day. It now takes longer than one day for me to start having strong reactions. Fasting and semi-fasting have been beneficial for my condition, but it was amazingly hard on me for a really long time and is still not easy. I tend to semi-fast for somewhere between one and two days (often around 36 hours) most months. I've done longer -- up to a week -- but two per month for a newcomer sounds like a lot to me and I assume that's because of how hard it is on me. So YMMV and probably will.