I used to regularly do 3. When I was poor it was reasonable for me to fast eating two days and fasting three. It is really interesting to actually know what real hunger feels like. It's so different than just eating because you are bored or feeling snacky. My bf is overweight and addicted to food. I asked him to fast a full 24 hours once and it changed his perspective of hunger. He now knows he's not hungry but eats because it makes him feel better.