Yes it absolutely does. You can do intermitted fasting for 10 years but most people will die when they continuously fast for more than 20 days unassisted by IV nutrients. Are we really on the same page here?

Your religious experience of skipping lunch and having a late dinner used to be my daily routine during uni, aside from a couple of coffees with a cig. Fasting for 12-16 hours is very different from fasting for 120-160 hours. Whatever you may think, you cannot be mentally conditioned not to eat at all. I'm having trouble believing that people extrapolate their experience of skipping a meal to not eating anything for days or weeks in a row.