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National Institute on Alcohol Abuse and Alcoholism
No. 16 PH 315 April, 1992
Alcohol Alert, a publication of the National Institute on Alcohol Abuse and Alcoholism, provides timely information on alcohol research and treatment to health professionals and other interested people. This issue is the sixteenth in the series.

Moderate Drinking

Moderate drinking is difficult to define because it means different things to different people. The term is often confused with "social drinking," which refers to drinking patterns that are accepted by the society in which they occur. However, social drinking is not necessarily free of problems. Moderate drinking may be defined as drinking that does not generally cause problems, either for the drinker or for society. Since there are clearly both benefits and risks associated with lower levels of drinking. this Alcohol Alert will explore potentially positive and adverse effects of "moderate" drinking.

It would be useful if the above definition of moderate drinking were bolstered by numerical estimates of "safe" drinking limits. However, the usefulness of quantitative definitions of moderate drinking is compromised by the likelihood that a given dose of alcohol may affect different people differently. Adding further complexity, the pattern of drinking is also an important determinant of alcohol-related consequences. Thus, while epidemiologic data are often collected in terms of the "average number of drinks per week," one drink taken each day may have different consequences than seven drinks taken on a Saturday night (1).

Despite the complexity, numerical definitions of moderate drinking do exist. For example, guidelines put forth jointly by the U.S. Department of Agriculture and the U.S. Department of Health and Human Services (2) define moderate drinking as no more than one drink a day for most women. and no more than two drinks a day for most men. A standard drink is generally considered to be 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of 80-proof distilled spirits . Each of these drinks contains roughly the same amount of absolute alcohol -- approximately 0.5 ounce or 12 grams (3).

These guidelines exclude the following persons, who should not consume alcoholic beverages: women who are pregnant or trying to conceive; people who plan to drive or engage in other activities that require attention or skill; people taking medication, including over-the-counter medications; recovering alcoholics; and persons under the age of 21 (2). Although not specifically addressed by the guidelines, alcohol use also is contraindicated for people with certain medical conditions such as peptic ulcer.

The existence of separate guidelines for men and women reflects research findings that women become more intoxicated than men at an equivalent dose of alcohol (4). This results, in part, from the significant difference in activity of an enzyme in stomach tissue of males and females that breaks down alcohol before it reaches the bloodstream. The enzyme is four times more active in males than in females (5). Moreover, women have proportionately more fat and less body water than men. Because alcohol is more soluble in water than in fat, a given dose becomes more highly concentrated in a female's body water than in a male's (6). Since the proportion of body fat increases with age, Dufour and colleagues recommend a limit of one drink per day for the elderly (7).

Benefits of Moderate Drinking

Psychological benefits of moderate drinking. A review of the literature (8) suggests that lower levels of alcohol consumption can reduce stress: promote conviviality and pleasant and carefree feelings: and decrease tension, anxiety, and self-consciousness. In the elderly, moderate drinking has been reported to stimulate appetite, promote regular bowel function, and improve mood (7).

Cardiovascular benefits of moderate drinking.

There is a considerable body of evidence that lower levels of drinking decrease the risk of death from coronary artery disease (CAD). This effect has been demonstrated in a broad range of older epidemiologic studies (9). More recently, Boffetta and Garfinkel (10) found that white American men who reported in 1959 that they consumed an average of fewer than three drinks per day were less likely to die during the next 12 years than men who reported abstinence. This finding was due primarily to a reduction in CAD. In a similar study using a wide range of ethnic groups. De Labry and colleagues (11) found that rates of overall mortality were lowest for men who consumed fewer than three drinks per day over a 12-year period.

Similar results have been obtained with female subjects. Stampfer and colleagues (12) analyzed data on middle-aged women and determined that consumption of approximately one drink per day decreases the risks of coronary heart disease. Razay and colleagues (13), using a random population sample, found consumption of up to two drinks per day to be associated with lower levels of cardiovascular risk factors in women. In postmenopausal women. the apparent protective effect of alcohol may be explained in part by an alcohol-induced increase in estrogen levels (14).

Various researchers have suggested that moderate drinking is not protective against CAD, arguing that higher mortality among abstainers results from including among them people who have stopped drinking because of ill health. Higher mortality among these "sick quitters" would explain the comparative longevity of moderate drinkers (15.16.17). However, studies investigating the "sick quitter" effect do not support that conclusion: including "sick quitters" in the abstinent category cannot completely explain the apparent protective effect of moderate drinking against CAD (10,18,19,20).

Risks of Moderate Drinking

There are risks that might offset the benefits of moderate drinking. Research shows that adverse consequences may occur at relatively low levels of consumption (1).

Stroke. A review of epidemiologic evidence concludes that moderate alcohol consumption increases the potential risk of strokes caused by bleeding, although it decreases the risk of strokes caused by blocked blood vessels (21).

Motor vehicle crashes. While there is some evidence to suggest that low blood alcohol concentrations (BACs) bear little relationship to road crashes, impairment of driving-related skills by alcohol has been found to begin at 0.05 percent BAC or lower, with rapidly progressing deterioration as the BAC rises (22). A man weighing 140 pounds might attain a BAC of 0.05 percent after two drinks.

Interactions with medications. Alcohol may interact harmfully with more than 100 medications, including some sold over the counter (23). The effects of alcohol are especially augmented by medications that depress the function of the central nervous system, such as sedatives, sleeping pills, anticonvulsants, antidepressants, antianxiety drugs, and certain painkillers. There is a consequent increased danger of driving an automobile after even moderate drinking if such medications are taken (24). In advanced heart failure, alcohol may not only worsen the disease, but also interfere with the function of medications to treat the disease (25).

Cancer. Although most evidence suggests an increased risk for certain cancers only among the heaviest drinkers, moderate drinking may be weakly related to female breast cancer. In one study (26), breast cancer was approximately 50 percent more likely to develop in women who consumed three to nine drinks per week than in women who drank fewer than three drinks per week. Although evidence concerning large bowel cancer is conflicting, one study suggests the possibility of a weak relation to consumption of one or more drinks per day (27).

Birth defects. Several ongoing studies are exploring the fetal risks associated with low levels of alcohol consumption. In one study (28), children whose mothers reported consuming an average of two to three drinks per day during pregnancy were smaller in weight, length, and head circumference and had an increased number of minor physical anomalies when examined at intervals through the age of 3. In addition, mothers' self-reported consumption of as few as two drinks per day during pregnancy was found to be related to a decrease in IQ scores of 7-year-old children (29).

The question of whether moderate drinking is a risk factor for the fetus is not altogether seltled, because mothers' self-reports of alcohol consumption may be underestimates (30). However, animal research provides additional evidence for adverse fetal effects from low levels of drinking. Nervous system abnormalities occurred in monkeys whose mothers were exposed weekly to low doses of alcohol. An effect occurred at a maternal BAC as low as 0.024 percent (31). A 120-pound woman might attain this BAC after one drink. Similarly, low prenatal alcohol doses produced biochemical and physiological changes in rat brains (32,33).

Shift to heavier drinking. Recovering alcoholics, as well as people whose families have alcohol problems, may not be able to maintain moderate drinking habits (2). Once a person progresses from moderate to heavier drinking, the risks of social problems (for example, drinking and driving, violence, trauma) and medical problems (for example. liver disease, pancreatitis, brain damage, reproductive failure, cancer) increase greatly (34).

Moderate Drinking -- A Commentary

by NIAAA Director Enoch Gordis, M.D.

As noted in this Alcohol Alert drinking at "moderate levels" (up to two drinks a day for men and one drink a day for women) has both benefits and risks. Therefore, it should not be surprising that there are questions about what advice to give to individuals about using alcohol.

Research aimed at more clearly defining the circumstances that increase risk and the categories of individuals who are at risk for alcohol-related problems will help individuals and the professionals who advise them to make more informed decisions concerning alcohol use. Better understanding of the biological mechanisms involved in the cardioprotective aspects of moderate alcohol use also could lead researchers to find alternate ways to provide the same protection.

Current advice to individuals should acknowledge that there are tradeoffs involved in each decision about drinking: reducing risk of developing coronary artery disease, for example, may be offset by risk of developing another alcohol-related health condition. In general, if an individual is drinking "moderately" and does not fit into one of the special risk categories discussed in the Alcohol Alert, there is no reason to recommend anything different. Similarly, individuals who are not yet drinking (young adults who have recently turned 21. for example), and not at special risk, can be told that "moderate drinking" will probably not be harmful. (Abstinent individuals, however, should not be advised to begin to drink two drinks a day solely to protect against coronary artery disease.) Finally, those who are at higher risk (because of a family history of alcoholism, for example) must be made aware of the tradeoffs involved in decisions to drink.

Selected issues of Alcohol Alert related to "Moderate Drinking" may be of interest to readers: "Alcohol and Aging" (No. 2) "Alcohol and Women" (No. 10) and "Fetal Alcohol Syndrome" (no 13) See p. 4 for instructions on ordering copies. [Note from IPRC: copies may be downloaded from this WWW site.]


(1) Werch, C.E.; Gorman, D. R. & Marty, P. .J Relationship between alcohol consumption and alcohol problems in young adults. Journal of Drug Education 17(3):261-276, 1987.

(2) U.S. Department Of Agriculture/U.S. Department ot Health and Human Services. Home and Garden Bulletin No 232. Nutrition and Your Health: Dietary Guidelines for Americans, 3rd ed. Washington. DC Supt. of Docs., U.S. Govt Print Off., 1990.

(3) Whelan, E.M. To your health. Across the Board Jan., 1988. pp 49-53.

(4) Jones, B.M.. & Jones M.K. Alcohol effects in women during the menstrual cycle. Annals of the New York Academy of Sciences 273:576-587, 1976.

(5) Frezza M.; DiPadova C.: Pozzato, G.; Terpin, M.; Baraona, E.: & Lieber C.S. High blood alcohol levels in women: The role of decreased gastric alcohol dehydrogenase activity and first-pass metabolism. New England Journal of Medicine 322(2):95-99, 1990.

(6) Goist,K.C., & Sutker P.B. Acute alcohol intoxication and body composition in women and men. Biochemistry & Behavior 22:811-814. 1985.

(7) Dufour, M.C.; Archer L.; & Gordis. E. Alcohol and the elderly. Clinics in Griatric Medicine 8(1):127-141. 1992.

(8) Baum-Baicker, C. The psychological benefits of moderate alcohol consumption: A review of the literature. Drug and Alcohol Dependence 15:305-322. 1985

(9) Moore, R.D.. & Pearson. T.A. Moderate alcohol consumption and coronary artery disease: A review. Medicine 65(4):242-267. 1986.

(10) Boffetta, P. & Garfinkel. L. Alcohol drinking and mortality among men enrolled in an American Cancer Society prospective study. Epidemiology 1(5):342-348, 1990.

(11) De Labry, L.O.: Glynn. R.J.: Levenson. M.R.; Hermos, J.A.; LoCastro, J.S.; & Vokonas P.S. Alcohol consumption and mortality in an American male population: Recovering the U-shaped curve--findings from the normative aging study. Journal of Studies on Alcohol 53(1):25-32. 1992.

(12) Stampfer, M.J.; Coldita, G.A.; Willett W.C.; Speizer F.E.; & Hennekens, C.H. A prospective study of moderate alcohol consumption and the risk of coronary disease and stroke in women. New England Journal of Medicine 319(5):267-273. 1988.

(13) Razay, G.: Heaton. K.W.; Bolton. C.H.; & Hughes A.O. Alcohol consumption and its relation to cardiovascular risk factors in British women. British Medical Journal 304:80-83, 1992.

(14) Gavaler, J.S.. & Van Thiel D.H. The association between moderate alcoholic beverage consumption and serum estradiol and testosterone levels in normal postmenopausal women: Relationship to the literature Alcoholism: Clinical and Expenmental Research 16(1):87-92, 1992.

(15) Marmot, M. & Brunner E. Alcohol and cardiovascular disease: The status of the U-shaped curve. British Medical Journal 303:565 568, 1991.

(16) Shaper, A.G. Alcohol and mortality: A review of prospective studies. British Journal of Addiction 85:837-847, 1990.

(17) Shaper, A.G.; Wannamethee. G.; & Walker. M. Alcohol and mortality in British men: Explaining the U-shaped curve. Lancet 2(8623):1267-1273. 1988.

(18) Klatsky, A.L.: Armstrong. M.A.: & Friedman G.D. Risk of cardiovascular mortality in alcohol drinkers, ex-drinkers and nondrinkers. American Journal of Cardiology 66:1237-1242, 1990.

(19) Jackson, R.; Scragg.R.; & Beaglehole, R. Alcohol consumption and risk of coronary heart disease. British Medical Journal 303:211-216, 1991

(20) Rimm, E.B.; Giovannucci, E.L.; Willett, W.C.; Colditz. G.A.; Ascherio A.; Rosner. B.; & Stampfer, M.J. Prospective study of alcohol consumption and risk of coronary disease in men. Lancet 338(8765):464-468, 1991.

(21) Camargo, C.A., Jr. Moderate alcohol consumption and stroke: The epidemiologic evidence. Stroke 20(12):1611-1626, 1989.

(22) Council on Scientific Affairs. Alcohol and the driver. Journal of the American Medical Association 255(4):522-52, 1986.

(23) Shinn, A.F.. & Shrewsbury, R.P., eds., Evaluations of Drug Interactions. New York: Macmillan. 1988.

(24) Gilman, A.G.; Rall T.W.; Nies, A.S.; & Taylor, P. eds. Goodman and Gilman's The Pharmacological Basis of Therapeutics. New York: Pergamon Press. 1990.

(25) Thomas, B.A., & Regan, T.J. lnteractions between alcohol and cardiovascular medications. Alcohol Health & Research World 14(4):333-339, 1990.

(26) Willett, W.C.; Stampfer. M.J.; Colditz. G.A.; Rosner, B.A.; Hennekens, C.H.; & Speizer, F.E. Moderate alcohol consumption and the risk of breast cancer. New England Journal of Medicine 316:1174-1180, 1987.

(27) Klatsky, A.L.: Armstrong, M.A.: Friedman, G.D.; & Hiatt, R.A. The relations of alcoholic beverage use to colon and rectal cancer. American Journal of Epidemiology 128(5):1007-1015, 1988.

(28) Day, N.L.; Robles, N.; Richardson, G.; Geva, D.; Taylor, P.; Scher, M.; Stoffer, D.; Cornelius, M.; & Goldschmidt, L. The effects of prenatal alcohol use on the growth of children at three years of age. Alcoholism: Clinical and Experimental Research 15(1):67-71, 1991.

(29) Streissguth, A.P.; Barr, H.M.; & Sampson, P.D. Moderate prenatal alcohol exposure: Effects on child IQ and learning problems at age 7 1/2 years. Alcoholism: Clinical and Experimental Research 14(5):662-669. 1990.

(30) Ernhart, C.B.; Morrow-Tlucak, M.; Sokol, R.J.; & Martier, S. Underreporting of alcohol use in pregnancy/ Alcoholism: Clinical and Experimental Research 12(4):506-511, 1988.

(31) Clarren, S.K.; Astley, S.J.; Bowden, D. M.; Lai, H.; Milam, A.H.; Rudeen, P.K.; & Shoemaker, W.J. Neuroanatomic and neurochemical abnormalities in nonhuman primate infants exposed to weekly doses of ethanol during gestation. Alcoholism: Clinical and Experimental Research 14(5):674-683. 1950

(32) Farr, K.L.; Montano, C.Y.; Paxton. L.L.; & Savage. D.D. Prenatal ethanol exposure decreases hippocampal 3H-glutamate binding in 45-day-old rats. Alcohol 5(2):125 133, 1988.

(33) Swartzwelder, H.S,; Farr, K.L.; Wilson, W.A.; & Savage, D.D. Prenatal exposure to ethanol decreases physiological plasticity in the hippocampus of the adult rat. Alcohol 5(2):121-124, 1988.

(34) National Institute on Alcohol Abuse and Alcoholism. Seventh Special Report to the U.S. Congress on Alcohol and Health. DHHS Pub No. (ADM)90-1656. Washington, DC: Supt. of Docs., U.S Govt. Print. Off., 1990.

All material contained in the Alcohol Alert is in the public domain and may be used or reproduced without permission from NIAAA. Citation of the source is appreciated. Copies of the Alcohol Alert are available free of charge from the Office for Substance Abuse Prevention's National Clearinghouse for Alcohol and Drug Information--ONCADI. P.O. Box 2345. Rockville. MD 20852. Telephone 301-468-2600 or 1 800-729-6686

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