Fasting is primarily a movement of willing abstinence or reduction from certain or all food, drink, or both, for a period of time. An absolute fast is normally defined as abstinence from all food and liquid for a defined period, usually a period of 24 hours, or a number of days. Water fasting allows drinking water but nothing else. Other fasts may be only partially restrictive, limiting particular foods or substances. The fast may also be intermittent in nature. Fasting practices may preclude intercourse and other activities as well as food.
In a physiological context, fasting may refer to the metabolic status of a person who has not eaten overnight, or to the metabolic state achieved after complete digestion and absorption of a meal. Several metabolic adjustments occur during fasting, and some diagnostic tests are used to determine a fasting state. For example, a person is assumed to be fasting after 8–12 hours from their last meal. Metabolic changes toward the fasting state begin after absorption of a meal (typically 3–5 hours after a meal); "post-absorptive state" is synonymous with this usage, in contrast to the postprandial state of ongoing digestion.
Fasting and abstinence in the Roman Catholic Church
The Catholic Church historically observes the discipline of fasting or abstinence at various times each year. For Catholics, fasting is the reduction of one's intake of food, while abstinence refers to refraining from meat (or another type of food). The Catholic Church teaches that all people are obliged by God to perform some penance for their sins, and that these acts of penance are both personal and corporeal. The purpose of fasting is spiritual focus, self-discipline, imitation of Christ, and performing penance.
Contemporary Vatican legislation, which is followed by Catholics of the Latin Rite (who comprise most Catholics) is rooted in the 1966 Apostolic Constitution of Pope Paul VI, Paenitemini, and codified in the 1983 Code of Canon Law (in Canons 1249–1253). According to Paenitemini and the 1983 Code of Canon Law, on Ash Wednesday and Good Friday, both abstinence and fasting are required of Catholics who are not exempted for various reasons. All Fridays of the year are days of penance. All persons who are fourteen years old and older are bound by the law of abstinence on all Fridays that are not Solemnities. Nevertheless, both Paenitemini and the 1983 Code of Canon Law permitted the Episcopal Conferences to propose adjustments of the laws on fasting and abstinence for their home territories, and most have done so. For example, in some countries, the Bishops' Conferences have obtained from Rome the substitution of pious or charitable acts for abstinence from meat on all Fridays of the year (including Fridays of Lent) except Good Friday. Others continue to abstain from eating meat on Lenten Fridays, but not on Fridays outside of Lent. Still others voluntarily abstain from meat on Fridays throughout the year.
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