" There is no reason to be alarmed by benign, occasional, short-term hunger. Given base-level good health, you will not perish. You won’t collapse in a heap and need to be rescued by the cat. Your body is designed to go without food for longish periods, even if it has lost the skill through years of grazing, picking, and snacking. Research has found that modern humans tend to mistake a whole range of emotions for hunger.6 We eat when we’re bored, when we’re thirsty, when we’re around food (when aren’t we?), when we’re with company, or simply when the clock happens to tell us it’s time for food. Most of us eat, too, just because it feels good. This is known as hedonic hunger, "

― Michael Mosley , The Fast Diet: The Simple Secret of Intermittent Fasting: Lose Weight, Stay Healthy, Live Longer