Fasting is primarily an act 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 24 hours. Other fasts may be only partially restrictive, limiting particular foods or substances. The fast may also be intermittent in nature.
Fasting practices may preclude sexual intercourse and other activities as well as food. Extended fasting has been recommended as therapy for various conditions by health professionals of many cultures, throughout history, from ancient to modern. Fasting is also a part of many religious observances.
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The Daily Omnivore 