The reasons for these health benefits relate to the fact that the human body appears to be designed to thrive in a cycle of “feast and famine.” By imitating the ancestral conditions of cyclical nourishment, your body enters into a state of optimal functioning. Three major mechanisms by which fasting benefits your health include:

Increased insulin sensitivity and mitochondrial energy efficiency. […] Reduced oxidative stress. […] Increased capacity to resist stress, disease and aging.

~ Jeff Roberts from, «https://insights.collective-evolution.com/2015/02/05/why-restricting-your-eating-time-period-to-8-hours-will-transform-your-health-fitness/»

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