"Fasting is the willful refrainment from eating and sometimes drinking (see Water fasting and Juice fasting). From a purely physiological context, "fasting" may refer to the metabolic status of a person who has not eaten overnight (see the "Breakfast"), or to the metabolic state achieved after complete digestion and absorption of a meal. Several metabolic adjustments occur during fasting. Some diagnostic tests are used to determine a fasting state. For example, a person is assumed to be fasting once 8–12 hours have elapsed since the last meal. Metabolic changes of the fasting state begin after absorption of a meal (typically 3–5 hours after eating)." - (en.wikipedia.org 15.01.2022)
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