I also asked that question in another comment. If i eat dinner at 6pm, Im not hungry the rest of the day, overnight nor in the morning when I wake up. Around 10 or 11 I start to feel hunger that doesnt go away - So i eat. 16-18 hours has passed but I was never counting or thinking about it... Is that really fasting or denying myself food? Is it considered fasting to not constantly snack and crave processed foods?
To a certain extent I think it depends your level of activity. If I'm sedentary and I eat a big dinner I usually won't feel hungry at least until 3pm the next day and sometimes it can be full 24h before I really feel hunger kick in again.
It's been that way as long as I can remember but I try to make sure I eat something in the morning anyway because I noticed that I function better that way (duh!)
I think avoiding sugar makes a significant difference. I love sweet treats but I've eliminated the vast majority of sugar in foods and drinks that I consume on a daily basis. Occasionally I'll start eating cereal for breakfast and I notice that it makes me hungry more often and it completely messes with my energy levels, so I stop.
