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Abstinence is a self-enforced restraint from indulging in bodily activities that are widely experienced as giving pleasure. Most frequently, the term refers to sexual abstinence, or abstinence from alcohol or food. The practice can arise from religious prohibitions and practical considerations. Abstinence may also refer to drugs. For example you can abstain from smoking. Abstinence has diverse forms. Commonly it refers to a temporary or partial abstinence from food, as in fasting. In the twelve-step program of Overeaters Anonymous abstinence is the term for refraining from compulsive eating, akin in meaning to sobriety for alcoholics. Because the regimen is intended to be a conscious act, freely chosen to enhance life, abstinence is sometimes distinguished from the psychological mechanism of repression. The latter is an unconscious state, having unhealthy consequences. Freud termed the channeling of sexual energies into other more culturally or socially acceptable activities, "sublimation".
Abstinence may arise from an ascetic element, present in most faiths, or from a subjective need for spiritual discipline. In its religious context, abstinence is meant to elevate the believer beyond the normal life of desire, to a chosen ideal, by following a path of renunciation.
Both Jews and Muslims abstain from pork in their regular diet.
In both Christianity and Islam, amongst others, pre-marital sex is prohibited.
Also, Catholics abstain from food and drink for an hour prior to taking Holy Communion, and abstain from meat on Ash Wednesday and on Fridays during Lent. Many Traditionalist Catholics abstain from eating meat all Fridays in the year.
Orthodox Christians abstain from food and drink from midnight on the day they receive Holy Communion, and abstain from meat and dairy on Wednesdays and Fridays throughout the year, as well as during Great Lent.
Catholics distinguish between fasting and abstinence; the former referring to the discipline of taking one full meal a day, and the latter signifying the discipline of eating no meat (fish is allowed).
Some Protestants have preferred to abstain from drinking alcohol and the use of tobacco.
Mormons abstain from certain foods and drinks by combining spiritual discipline with health concerns. Mormons also fast one day a month, for both spiritual and charitable reasons (the money saved by skipping meals is donated to the needy).
In India, Buddhists, Jains, Sikhs, and Hindus abstain from eating meat and fish (basically, all living animals) on the grounds both of health and of reverence for all sentient forms of life. Total abstinence from feeding on the flesh of cows is a hallmark of Hinduism. In addition, lay and monastic Buddhists refrain from killing any living creature and from consuming intoxicants, and bhikkhus keep vows of chastity. In Theravada Buddhism, bhikkhus also refrain from eating in the afternoon, and cannot accept money.
In medicine, abstinence is the discontinuation of a drug, often an addictive one. This might, in addition to craving after the drug, be expressed as withdrawal syndromes. Abstinence from smoking is also recommended for those who undertake or have recently undertaken cosmetic surgery. The American Society of Plastic Surgeons (ASPS) said about this issue, in a paper about smoking and its effects on cosmetic surgery,
I believe that total absistence from smoking is necessary prior to major cosmetic and reconstructive surgery. 
Fasting is primarily the act of willingly abstaining from some or all food, drink, or both, for a period of time. A fast may be total or partial concerning that from which one fasts, and may be prolonged or intermittent as to the period of fasting. Fasting practices may preclude sexual activity as well as food, in addition to refraining from eating certain types or groups of foods; for example, one might refrain from eating meat. A complete fast in its traditional definition is abstinence of all food and liquids except for water.
Vegetarianism is the practice of a diet that excludes meat (including game, marine mammals and slaughter by-products), poultry, fowl, fish, shellfish and other sea creatures. There are several variants of the diet, some of which also exclude eggs and/or some products produced from animal labour such as dairy products and honey.
Smoking cessation is the action leading towards the discontinuation of the consumption of a smoked substance, mainly tobacco, but it may encompass cannabis and other substances as well.
Teetotalism is the practice and promotion of complete abstinence from alcoholic beverages.
Some common reasons for choosing teetotalism are religious, health, family, philosophical and/or social reasons, and, sometimes, as simply a matter of taste preference. When at drinking establishments, they either abstain from drinking or consume non-alcoholic beverages such as tea, coffee, water, juice, and soft drinks.
Contemporary and colloquial usage has somewhat expanded teetotalism to include strict abstinence from most "recreational" intoxicants (legal and illegal, see controlled substances). Most teetotaller organizations also demand from their members that they do not promote or produce alcoholic intoxicants.
A general abstinence from pleasures or leisures, either partial or full, may be motivated by ambition, career or general self-respect (excluding the point of view that even the latter examples may be regarded as sources of pleasure).
It is widely accepted that abstinence from addictive drugs gives successful outcome . However, it is not certain whether a general abstinence from pleasures of leisure yields higher productivity. Too much work generates stress and its potential adverse effects. Furthermore, the effort itself to achieve abstinence may consume willpower from its ultimate purpose. Total abstinence from pleasure or leisure is practically impossible and instead an individual work-life balance is necessary.
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