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" 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
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" As long as we have plenty of food, our bodies are mainly interested in growing, having sex, and reproducing. Nature has no long-term plans for us; she does not invest in our old age. Once we’ve reproduced, we become disposable. So what happens if you decide to fast? Well, the body’s initial reaction is one of shock. Signals go to the brain reminding you that you are hungry, urging you to go out and find something to eat. But you resist. The body now decides that the reason you are not eating as much and as frequently as you usually do must be because you are now in a famine situation. In the past this would have been quite normal. In a famine situation, there is no point in expending energy on growth or sex. Instead, the wisest thing the body can do is to spend its precious store of energy on repair, trying to keep you in reasonable shape until the good times return once more. "
― Michael Mosley , The Fast Diet: The Simple Secret of Intermittent Fasting: Lose Weight, Stay Healthy, Live Longer