Fasting is nothing new to the human race. Though historically, it is unlikely that we imposed a calorie deficit upon ourselves, more that over the course of a year sometimes food was scarcer than at other times.
Why fast now we live in a state of plenty? There are many different theories on this.
Advocates of fasting, for intermittent periods, report that this approach may help to burn fat rather than store it, may help to regulate other important hormonal levels that help to reduce your risks of cardiovascular disease, diabetes, and many others. Also, there is the potential for the hormones which regulate appetite to be rebalanced. These, which include the all-important leptin and ghrelin may well be out of kilter in our 21st C world off food abundance, stress and poor sleep patterns.
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