For example, if we consider fasting as the period necessary to switch from a primarily sugar-burning mode to a fat-burning mode, then only periods of abstention from food lasting two or three days or more can be considered fasting. The same length of fasting appears to be necessary to trigger the activation of “regenerative” programs. This does not mean that shorter periods of abstention from food cannot be beneficial, but that we should not use words like “Intermittent Fasting” to include interventions that are very different and have very different effects just like we don’t want to place in
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