Which is why fasting a couple of days a week is a good idea because it's not a long dreary slog with no end in sight. One day on low calories, eat what you want on the non-fast days, then one more non-consecutive fast day in the week. The studies I've seen appear to show that most people don't lash out on the unhealthy stuff on non-fast days, possibly because they can see that they are making progress with the fast days.