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Underage Drinking: A Major Public Health Challenge

Alcohol Alert from the NIAAA

By the time they reach the eighth grade, nearly 50 percent of adolescents have had at least one drink, and over 20 percent report having been “drunk” (1). Approximately 20 percent of 8th graders and almost 50 percent of 12th graders have consumed alcohol within the past 30 days (1). Among 12th graders, almost 30 percent report drinking on 3 or more occasions per month (2).

Approximately 30 percent of 12th graders engage in heavy episodic drinking, now popularly termed binge drinking that is, having at least five or more drinks on one occasion within the past 2 weeks - and it is estimated that 20 percent do so on more than one occasion (2).

Apart from being illegal, underage drinking poses a high risk to both the individual and society (3). For example, the rate of alcohol–related traffic crashes is greater for drivers ages 16 to 20 than for drivers age 21 and older (4). Adolescents also are vulnerable to alcohol–induced brain damage, which could contribute to poor performance at school or work.

In addition, youthful drinking is associated with an increased likelihood of developing alcohol abuse or dependence later in life. Early intervention is essential to prevent the development of serious alcohol problems among youth between the ages of 12 and 20.

This Alcohol Alert describes some of the most harmful consequences of underage drinking as well as prevention and treatment approaches that can be applied successfully to meet the unique needs of this age group.

Injury and Social Consequences

Underage alcohol use is more likely to kill young people than all illegal drugs combined (5,6). Some of the most serious and widespread alcohol–related problems among adolescents are discussed below.

Drinking and Driving. Motor vehicle crashes are the leading cause of death among youth ages 15 to 20 (8). Adolescents already are at increased risk through their relative lack of driving experience (9), and drivers younger than 21 are more susceptible than older drivers to the alcohol–induced impairment of driving skills (4,9). The rate of fatal crashes among alcohol–involved drivers between 16 and 20 years old is more than twice the rate for alcohol–involved drivers 21 and older (10).

Suicide. Alcohol use interacts with conditions such as depression and stress to contribute to suicide, the third leading cause of death among people between the ages of 14 and 25 (11,12). In one study, 37 percent of eighth grade females who drank heavily reported attempting suicide, compared with 11 percent who did not drink (13).

Sexual Assault. Sexual assault, including rape, occurs most commonly among women in late adolescence and early adulthood, usually within the context of a date (14). In one survey, approximately 10 percent of female high school students reported having been raped (5). Research suggests that alcohol use by the offender, the victim, or both, increases the likelihood of sexual assault by a male acquaintance (15).

High-Risk Sex. Research has associated adolescent alcohol use with high–risk sex (for example, having multiple sexual partners and failing to use condoms). The consequences of high–risk sex also are common in this age group, particularly unwanted pregnancy and sexually transmitted diseases, including HIV/AIDS (5). According to a recent study, the link between high–risk sex and drinking is affected by the quantity of alcohol consumed. The probability of sexual intercourse is increased by drinking amounts of alcohol sufficient to impair judgment, but decreased by drinking heavier amounts that result in feelings of nausea, passing out, or mental confusion (16).

Alcohol's Effects on the Brain

Adolescence is the transition between childhood and adulthood. During this time, significant changes occur in the body, including rapid hormonal alterations and the formation of new networks in the brain (17). Adolescence is also a time of trying new experiences and activities that emphasize socializing with peers, and conforming to peer–group standards (18,19). These new activities may place young people at particular risk for initiating and continuing alcohol consumption. Exposing the brain to alcohol during this period may interrupt key processes of brain development, possibly leading to mild cognitive impairment as well as to further escalation of drinking. (For a review, see Reference 17.)

Subtle alcohol–induced adolescent learning impairments could affect academic and occupational achievement (17). In one study, Brown and colleagues (20) evaluated short–term memory skills in alcohol–dependent and nondependent adolescents ages 15 to 16. The alcohol–dependent youth had greater difficulty remembering words and simple geometric designs after a 10–minute interval. In this and similar studies (21,22), memory problems were most common among adolescents in treatment who had experienced alcohol withdrawal symptoms (20). The emergence of withdrawal symptoms generally indicates an established pattern of heavy drinking. Their appearance at a young age underscores the need for early intervention to prevent and treat underage drinking.

Although the prevalence of high–risk drinking declines after early adulthood (23), alcohol–induced brain damage may persist. Memory impairment has been found in adult rats exposed to alcohol during adolescence (17). In addition, sophisticated imaging techniques revealed structural differences in the brains of 17–year–old adolescents who displayed alcohol–induced intellectual and behavioral impairment. Specifically, the hippocampus—a part of the brain important for learning and memory—was smaller in alcohol–dependent study participants than it was in nondependent participants (24). Adolescents who began drinking at an earlier age had proportionately smaller hippocampal volumes compared with those who began later (24), suggesting that the differences in size were alcohol induced.

The Link Between Early Alcohol Use and Alcohol Dependence

Early alcohol use may have long–lasting consequences. People who begin drinking before age 15 are four times more likely to develop alcohol dependence at some time in their lives compared with those who have their first drink at age 20 or older (25). It is not clear whether starting to drink at an early age actually causes alcoholism or whether it simply indicates an existing vulnerability to alcohol use disorders (26). For example, both early drinking and alcoholism have been linked to personality characteristics such as strong tendencies to act impulsively and to seek out new experiences and sensations (27). Some evidence indicates that genetic factors may contribute to the relationship between early drinking and subsequent alcoholism (28,29). Environmental factors may also be involved, especially in alcoholic families, where children may start drinking earlier because of easier access to alcohol in the home, family acceptance of drinking, and lack of parental monitoring (27,26).

Prevention and Treatment

The immediate and long–term risks associated with adolescent alcohol use underscore the need for effective prevention and treatment programs. Research on the personal, social, and environmental factors that contribute to the initiation and escalation of drinking is essential for the development of such programs. It should be noted that preventing and identifying alcohol use disorders in youth require different screening, assessment, and treatment approaches than those used for adults (30,31). For example, although relapse rates following alcoholism treatment are similar for both adults and adolescents, social factors such as peer pressure play a much larger role in relapse among adolescents (31).

Personal factors such as childhood behavior problems (32) or a family history of alcohol use disorders (33) can help to identify high–risk youth and may suggest direction for interventions. Evidence suggests that the most reliable predictor of a youth’s drinking behavior is the drinking behavior of his or her friends (32,34). Many research–based interventions target the child’s relevant behavioral skills, such as his or her ability to react appropriately to peer pressure to drink, as well as his or her knowledge, attitudes, and intentions regarding alcohol use (35).

Positive beliefs about alcohol’s effects and the social acceptability of drinking encourage the adolescent to begin and continue drinking. However, youth often overestimate how much their peers drink and how positive their peers’ attitudes are toward drinking. Consequently, most prevention programs include social norms education, which uses survey data to counter students’ misperceptions of their peers’ drinking practices and attitudes about alcohol (36,35).

Family factors, such as parent–child relationships, discipline methods, communication, monitoring and supervision, and parental involvement, also exert a significant influence on youthful alcohol use (37,38). Accordingly, family–based prevention programs for youth have been developed—for example, Iowa’s Strengthening Families Program, which significantly delayed initiation of alcohol use by improving parenting skills and family bonding (37). The beneficial effects of this program on student alcohol involvement were still evident 4 years after the intervention (39).

Some school–based programs are aimed at adolescents who have already begun drinking. Preliminary research also has found promise in high school–based motivational programs that encourage self–change in problem drinkers (30).

Policy and Community Strategies

Another important factor in underage drinking is availability, that is, the degree of effort required to obtain alcohol, as determined by geographic, economic, and social factors (40,35). Consequently, interventions aimed at the individual must be supplemented by policy changes to help reduce youth access to alcohol and decrease the harmful consequences of established drinking (35). For example, raising the minimum legal drinking age in all States to 21 saved an estimated 20,000 lives between 1975 and 2000 (8). In addition, all States now have zero–tolerance laws, which set the legal blood alcohol limit for drivers younger than age 21 at 0.00 or 0.02 percent (41). This policy has been associated with a 20–percent decline in the proportion of single–vehicle, nighttime fatal crashes among drivers younger than age 21 (42,43).

The drinking and driving laws described above were implemented in the absence of an accompanying increase in existing law enforcement levels. The effectiveness of such measures is enhanced by integrating them into community–based strategies that involve the cooperation of local government agencies, the law enforcement community, business leaders, and grassroots organizations (35). Communities Mobilizing for Change on Alcohol (CMCA) is an example of a community–wide program that focused on policy changes to reduce youth access to commercial and social sources of alcohol (44,35). Communities that adopted the program experienced significantly fewer arrests for drinking and driving among youth ages 18 to 20 than did neighboring communities (45).

Comprehensive Interventions. Project Northland is an example of a successful comprehensive intervention that incorporated family, school, and community components to prevent or reduce alcohol use among adolescents. To determine the program’s effectiveness, researchers began testing the students in grade six; and, after 3 years, the prevalence of alcohol use by eighth graders was lower in intervention communities than in comparison sites, and especially among students who had not yet started drinking when the program began (46). During the next 2 years, interventions were only minimal, and the differences in the measures of alcohol use between the two groups of students disappeared. However, resumption of Project Northland activities in grades 11 and 12 had a significant positive effect on the students’ tendency to avoid alcohol use and binge drinking. Taken together, these results show the effectiveness of continued, age–appropriate prevention activities for delaying or reducing underage drinking (47).

Underage Drinking—A Commentary by NIAAA Director Ting–Kai Li, M.D.

The immediate and long–term risks associated with adolescent alcohol use underscore the need for effective prevention and treatment programs. Research toward those ends is a top priority at NIAAA. Studies have revealed genetic, biologic, developmental, and environmental influences on underage drinking.

Scientists have found that variability is a crucial aspect of alcohol problems across all age groups and thus is a key consideration in alcohol research. For example, there is a three– to fourfold between–individual variation in the rate of absorption, distribution, and elimination of alcohol (pharmacokinetics) and a two– to threefold between–individual variation in the sensitivity of the brain to the effects of a given concentration of alcohol (pharmacodynamics). Understanding the underlying causes of this variability, both genetic and nongenetic, should provide insights into underage drinking and binge–drinking patterns.

Through prevention and intervention strategies directed at the individual, family, school, and community, we aim to provide knowledge and change belief systems and social norms to reinforce the message that underage alcohol use is unacceptable. We also aim to enhance young peoples’ self–esteem, self–motivation, and identity formation to enable them to take responsibility for their own health by making informed, deliberate, and healthy choices regarding alcohol use.

Various intervention tools have brought about positive behavioral change with regard to underage drinking. Further studies will follow cohorts of young people from childhood through the college years, at different locations and in different settings, to determine whether these interventions are enduring and broadly applicable. Finding lasting solutions to such an entrenched problem will not be easy, but we are confident that diligent research efforts will meet this urgent challenge.

References

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