I've just passed the 19 hour mark of today's 24 hour water only fast. It is remarkable to me how easy it is. I'm not hungry in the slightest.
I actually find the fasting periods to be much easier than the eating ones. How so? Because when I'm eating, I'm constantly thinking/worried about getting enough calories (remember, I'm thin). So I end up forcing myself to eat, even though I'm not very hungry. That causes a certain amount of stress.
By contrast, when I'm fasting, I have no worries. I have more time, spend less money, and less stress.
Don't get me wrong: That first meal after the fast is always a good one, no matter what it consists of. I usually start to feel a little hunger around hour 21 or 22. So by the time I eat, I'm ready, and it tastes good.
Perhaps as I get further along this journey, I will stop worrying about getting enough calories, and just eat when I want to during my eating days. As long as my weight stays at a reasonable level, that would be the ideal.
Interestingly, others have tried this 24/24 style of alternate day fasting, and have had a very difficult time with it. One popular low carb blogger, Jimmy Moore, tried it and absolutely hated it. He found himself ravenously hungry, grouchy, unable to concentrate, and he completely gorged himself when he finally got to eat. See his comments here http://www.thelivinlowcarbshow.com/trying-out-dr-mike-eades-intermittent-fasting-concept-episode-67/.
I'm not sure if Jimmy just didn't give it enough time, or if it's just proof of the expression you often see on internet boards related to diet: YMMV (your mileage may vary).