On Alcohol
Leave it to the god of wine to liven things up around here...
Many writers are neither spirit nor wine, but rather spirits- of-wine: they can catch fire, and then they give off heat. - Friedrich Nietzsche
Alcohol plays a prevalent role in many cultures, with many of us toasting to big life moments, enjoying happy hours with coworkers or friends, or simply indulging in a few drinks after a long, stressful day.
There has long been caution against binge drinking, which roughly equates to consuming five or more drinks for men and four or more drinks for women in about two hours. If one has ever overindulged in ones favorite drinks, one knows that the next day is typically less than ideal and repeated alcohol abuse can impact one's mental and physical health.
Throughout the 10,000 or so years that humans have been drinking fermented beverages, they’ve also been arguing about their merits and demerits. The debate still lives on today, with a lively back-and-forth over whether alcohol is good or bad for one’s health and well being.
Research
Light-to-moderate drinking can lower risk of mortality from all-causes and cardiovascular disease, while heavy drinking can significantly increase risk of mortality from all-causes and cancer, according to a new study published in the Journal of the American College of Cardiology.
High alcohol consumption has been liked to a host of health issues, including cardiovascular disease, but alcohol in moderation is widely recommended. However, despite these recommendations, studies on the risk of mortality among light-to-moderate drinkers is often inconsistent. Researchers in this study examined the association between alcohol consumption and risk of mortality from all causes, cancer and cardiovascular disease in the U.S.
The researchers looked at data from 333,247 participants obtained through the National Health Interview Surveys from 1997 to 2009. Study participants were surveyed regarding their alcohol consumption status and patterns of use. Alcohol consumption patterns were divided into six categories: lifetime abstainers, lifetime infrequent drinkers, former drinkers and current light (less than three drinks per week), moderate (more than three drinks per week to less than 14 drinks per week for men or less than seven drinks per week for women) or heavy drinkers (more than 14 drinks per week for men or seven drinks per week for women).
Our research shows that light-to-moderate drinking might have some protective effects against cardiovascular disease, while heavy drinking can lead to death. A delicate balance exists between the beneficial and detrimental effects of alcohol consumption, which should be stressed to consumers and patients
Bo Xi, MD, associate professor at the Shandong University School of Public Health in China and the study’s lead author.
Throughout the length of the study, 34,754 participants died from all-causes. Of these, 8,947 mortalities were cardiovascular disease-specific (6,944 heart disease-related and 2,003 cerebrovascular-related deaths) and 8,427 mortalities were cancer-specific.
Researchers found that male heavy drinkers had a 25 percent increased risk of mortality due to all-causes and a 67 percent increase in mortality from cancer. These increases were not significantly noticed in women. There was no association found between heavy drinking and cardiovascular disease mortality. Moderate drinking was associated with a 13 percent and 25 percent decreased risk of all-cause mortality, and 21 percent and 34 percent decreased risk of cardiovascular disease mortality, respectively, in both men and women. Similar findings were observed for light drinking in both genders.
We have taken rigorous statistical approaches to address issues reported in earlier studies such as abstainer bias, sick quitter phenomenon and limited confounding adjustment in our study. A J-shaped relationship exists between alcohol consumption and mortality, and drinkers should drink with consciousness,
Sreenivas Veeranki, MD, DrPH, assistant professor in preventive medicine and community health at University of Texas Medical Branch.
Limitations to the study include obtaining alcohol consumption status through survey responses that may be subject to recall bias, as well as using self-reported responses at baseline.
In an accompanying editorial, Giovanni de Gaetano, MD, PhD, director of the Department of Epidemiology and Prevention at IRCCS Istituto Neurologico Mediterraneo Neuromed said that while younger adults should not expect considerable benefit from moderate drinking, “for most older persons, the overall benefits of light drinking, especially the reduced cardiovascular disease risk, clearly outweigh possible cancer risk.”
Balance
It’s safe to say that alcohol is both a tonic and a poison. The difference lies mostly in the dose. Its basic chemistry - It’s not the poison, it’s the dose; everything is toxic at some concentration. Moderate drinking seems to be good for the heart and circulatory system, and probably protects against type 2 diabetes and gallstones.
However, heavy drinking is a major cause of preventable death in most countries. In the U.S., alcohol is implicated in about half of fatal traffic accidents. Heavy drinking can damage the liver and heart, harm an unborn child, increase the chances of developing breast and some other cancers, contribute to depression and violence, and interfere with relationships.
Alcohol’s two-faced nature shouldn’t come as a surprise. The active ingredient in alcoholic beverages, a simple molecule called ethanol, affects the body in many different ways. It directly influences the stomach, brain, heart, gallbladder, and liver. It affects levels of lipids (cholesterol and triglycerides) and insulin in the blood, as well as inflammation and coagulation. It also alters mood, concentration, and coordination.
Good company, good wine, good welcome can make good people. - Henry VIII, Act 1 Scene 4 - William Shakespeare
Dosing
Loose use of the terms “moderate” and “a drink” has fueled some of the ongoing debate about alcohol’s impact on health.
In some studies, the term “moderate drinking” refers to less than 1 drink per day, while in others it means 3-4 drinks per day. Exactly what constitutes “a drink” is also ambiguous. In fact, even among alcohol researchers, there’s no universally accepted standard drink definition.
In the U.S., 1 drink is usually considered to be 12 ounces of beer, 5 ounces of wine, or 1½ ounces of spirits (hard liquor such as vodka or bourbon). Each delivers about 12 to 14 grams of alcohol on average, but there is a wider range now that microbrews and wine are being produced with higher alcohol content.
Overindulgence
Not everyone who likes to drink alcohol stops at just one. While many people drink in moderation, some don’t.
Heavy drinking can take a toll on the body. It can cause inflammation of the liver (alcoholic hepatitis) and lead to scarring of the liver (cirrhosis), a potentially fatal disease. It can increase blood pressure and damage heart muscle (cardiomyopathy). Heavy alcohol use has also been linked with several cancers: The World Cancer Research Fund and American Institute for Cancer Research indicate that there is convincing evidence linking alcohol to cancers of the mouth, pharynx, larynx, esophagus, breast, liver, colon, and rectum. The International Agency for Research on Cancer concluded that both the ethanol in alcohol and acetaldehyde, a chemical formed from the breakdown of ethanol, are carcinogenic to humans in high amounts. The risk is multiplied for drinkers who also smoke tobacco or have a poor diet.
Problem drinking also touches drinkers’ families, friends, and communities. According to the National Institute on Alcohol Abuse and Alcoholism and others:
In 2014, about 61 million Americans were classified as binge alcohol users (5 or more drinks on the same occasion at least once a month) and 16 million as heavy alcohol users (5 or more drinks on the same occasion on 5 or more days in one month).
Alcohol plays a role in one in three cases of violent crime.
In 2015, more than 10,000 people died in automobile accidents in which alcohol was involved.
Alcohol abuse costs about $249 billion a year.
Even moderate drinking carries some risks. Alcohol can disrupt sleep and one’s better judgment. Alcohol interacts in potentially dangerous ways with a variety of medications, including acetaminophen, antidepressants, anticonvulsants, painkillers, and sedatives. It is also addictive, especially for people with a family history of alcoholism.
Alcohol Increases Risk of Developing Breast Cancer
There is convincing evidence that alcohol consumption increases the risk of breast cancer, and the more alcohol consumed, the greater the risk.
A large prospective study following 88,084 women and 47,881 men for 30 years found that even 1 drink a day increased the risk of alcohol-related cancers (colorectum, female breast, oral cavity, pharynx, larynx, liver, esophagus) in women, but mainly breast cancer, among both smokers and nonsmokers. 1 to 2 drinks a day in men who did not smoke was not associated with an increased risk of alcohol-related cancers.
In a combined analysis of six large prospective studies involving more than 320,000 women, researchers found that having 2-5 drinks a day compared with no drinks increased the chances of developing breast cancer as high as 41%. It did not matter whether the form of alcohol was wine, beer, or hard liquor. [10] This doesn’t mean that 40% or so of women who have 2-5 drinks a day will get breast cancer. Instead, it is the difference between about 13 of every 100 women developing breast cancer during their lifetime—the current average risk in the U.S.—and 17 to 18 of every 100 women developing the disease. This modest increase would translate to significantly more women with breast cancer each year.
Folate
A lack of folate in the diet or folic acid, its supplement form, further increases the risk of breast cancer in women. Folate is needed to produce new cells and to prevent changes in DNA. Folate deficiency, as can occur with heavy alcohol use, can cause changes in genes that may lead to cancer. Alcohol also increases estrogen levels, which fuel the growth of certain breast cancer cells. An adequate intake of folate, at least 400 micrograms a day, when taking at least 1 drink of alcohol daily appears to lessen this increased risk. Folate can be obtained through dietary sources such as dark leafy greens and seafood, while another option is the use of supplementation.
Researchers found a strong association among three factors—genetics, folate intake, and alcohol—in a cohort from the Nurses’ Health Study II of 2866 young women with an average age of 36 who were diagnosed with invasive breast cancer. Those with a family history of breast cancer who drank 10 grams or more of alcoholic beverages daily (equivalent to 1 or more drinks) and ate less than 400 micrograms of folate daily almost doubled their risk (1.8 times) of developing the cancer. Women who drank this amount of alcohol but did not have a family history of breast cancer and ate at least 400 micrograms of folate daily did not have an increased breast cancer risk.
Alcohol and Weight Gain
One serving of alcohol on average contains 100-150 calories, so even a moderate amount of 3 drinks a day can contribute 300+ calories. Mixed drinks that add juice, tonic, or syrups will further drive up calories, increasing the risk of weight gain over time. Choosing a drink that is prepared neat or on the rocks limits the amount of added calories through sugars and mixers. A nice mezcal on the rocks is a go to for many.
However, a prospective study following almost 15,000 men at four-year periods found only an increased risk of minor weight gain with higher intakes of alcohol. Compared to those who did not change their alcohol intake, those who increased their intake by 2 or more drinks a day gained a little more than a half-pound. It was noted that calorie intake (not from alcohol) tended to increase along with alcohol intake.
Possible Health Benefits of Alcohol
What are some of the possible health benefits associated with moderate alcohol consumption?
Cardiovascular Disease
More than 100 prospective studies show an inverse association between light to moderate drinking and risk of heart attack, ischemic (clot-caused) stroke, peripheral vascular disease, sudden cardiac death, and death from all cardiovascular causes. The effect is fairly consistent, corresponding to a 25-40% reduction in risk. However, increasing alcohol intake to more than 4 drinks a day can increase the risk of hypertension, abnormal heart rhythms, stroke, heart attack, and death.
The connection between moderate drinking and lower risk of cardiovascular disease has been observed in men and women. It applies to people who do not have heart disease, and also to those at high risk for having a heart attack or stroke or dying of cardiovascular disease, including those with type 2 diabetes, high blood pressure, and existing cardiovascular disease. The benefits also extend to older individuals.
The idea that moderate drinking protects against cardiovascular disease makes sense biologically and scientifically. Moderate amounts of alcohol raise levels of high-density lipoprotein (HDL, or “good” cholesterol), and higher HDL levels are associated with greater protection against heart disease. Moderate alcohol consumption has also been linked with beneficial changes ranging from better sensitivity to insulin to improvements in factors that influence blood clotting, such as tissue type plasminogen activator, fibrinogen, clotting factor VII, and von Willebrand factor. Such changes would tend to prevent the formation of small blood clots that can block arteries in the heart, neck, and brain, the ultimate cause of many heart attacks and the most common kind of stroke.
Drinking Patterns Matter
What one drinks (beer or wine) doesn’t seem to be nearly as important as how one drinks. Having 7 drinks on a Saturday night and then not drinking the rest of the week isn’t at all the equivalent of having 1 drink a day. The weekly total may be the same, but the health implications aren’t. Among participants in the Health Professionals Follow-up Study, consumption of alcohol on at least three or four days a week was inversely associated with the risk for myocardial infarction. The amount consumed, under 10 grams a day or more than 30 grams, didn’t seem to matter as much as the regularity of consumption. A similar pattern was seen in Danish men.
A review of alcohol consumption in women from the Nurses’ Health Study I and II found that smaller amounts of alcohol (about 1 drink per day) spread out over four or more days per week had the lowest death rates from any cause, compared with women who drank the same amount of alcohol but in one or two days.
The most definitive way to investigate the effect of alcohol on cardiovascular disease would be with a large trial in which some volunteers were randomly assigned to have 1 or more alcoholic drinks a day and others had drinks that looked, tasted, and smelled like alcohol but were actually alcohol free. Many of these trials have been conducted for weeks, and in a few cases months and even up to 2 years, to look at changes in the blood, but a long-term trial to test experimentally the effects of alcohol on cardiovascular disease has not been done.
A recent successful effort in the U.S. to launch an international study was funded by the National Institutes of Health. Although the proposal was peer-reviewed and initial participants had been randomized to drink in moderation or to abstain, post hoc the NIH decided to stop the trial due to internal policy concerns. Unfortunately, a future long trial of alcohol and clinical outcomes may never be attempted again, but nevertheless, the connection between moderate drinking and cardiovascular disease almost certainly represents a cause-and-effect relationship based on all of the available evidence to date.
Beyond the Heart
The benefits of moderate drinking aren’t limited to the heart. In the Nurses’ Health Study, the Health Professionals Follow-up Study, and other studies, gallstones and type 2 diabetes were less likely to occur in moderate drinkers than in non-drinkers. The emphasis here, as elsewhere, is on moderate drinking.
In a meta-analysis of 15 original prospective cohort studies that followed 369,862 participants for an average of 12 years, a 30% reduced risk of type 2 diabetes was found with moderate drinking (0.5-4 drinks a day), but no protective effect was found in those drinking either less or more than that amount.
The social and psychological benefits of alcohol can’t be ignored. A drink before a meal can improve digestion or offer a soothing respite at the end of a stressful day; the occasional drink with friends can be a social tonic. These physical and social effects may also contribute to health and well-being.
Eat and drink as friends. The Taming of the Shrew, Act 1 Scene 2 - William Shakespeare
Genes Play a Role
Twin, family, and adoption studies have firmly established that genetics plays an important role in determining an individual’s preferences for alcohol and his or her likelihood for developing alcoholism. Alcoholism doesn’t follow the simple rules of inheritance set out by Gregor Mendel. Instead, it is influenced by several genes that interact with each other and with environmental factors.
There is also some evidence that genes influence how alcohol affects the cardiovascular system. An enzyme called alcohol dehydrogenase helps metabolize alcohol. One variant of this enzyme, called alcohol dehydrogenase type 1C (ADH1C), comes in two “flavors.” One quickly breaks down alcohol, the other does it more slowly. Moderate drinkers who have two copies of the gene for the slow-acting enzyme are at much lower risk for cardiovascular disease than moderate drinkers who have two genes for the fast-acting enzyme. Those with one gene for the slow-acting enzyme and one for the faster enzyme fall in between.
It’s possible that the fast-acting enzyme breaks down alcohol before it can have a beneficial effect on HDL and clotting factors. Interestingly, these differences in the ADH1C gene do not influence the risk of heart disease among people who don’t drink alcohol. This adds strong indirect evidence that alcohol itself reduces heart disease risk.
Shifting Benefits and Risks
The benefits and risks of moderate drinking change over a lifetime. In general, risks exceed benefits until middle age, when cardiovascular disease begins to account for an increasingly large share of the burden of disease and death.
For a pregnant woman and her unborn child, a recovering alcoholic, a person with liver disease, and people taking one or more medications that interact with alcohol, moderate drinking offers little benefit and substantial risks.
For a 30-year-old man, the increased risk of alcohol-related accidents outweighs the possible heart-related benefits of moderate alcohol consumption.
For a 60-year-old man, a drink a day may offer protection against heart disease that is likely to outweigh potential harm (assuming he isn’t prone to alcoholism).
For a 60-year-old woman, the benefit/risk calculations are trickier. Ten times more women die each year from heart disease (460,000) than from breast cancer (41,000). However, studies show that women are far more afraid of developing breast cancer than heart disease, something that must be factored into the equation.
The Bottom Line: Find the golden mean
Given the complexity of alcohol’s effects on the body and the complexity of the people who drink it, blanket recommendations about alcohol are out of the question. Because each of us has unique personal and family histories, alcohol offers each person a different spectrum of benefits and risks. Whether or not to drink alcohol, especially for “medicinal purposes,” requires careful balancing of these benefits and risks.
One’s healthcare provider should be able to help do this. Overall health and risks for alcohol-associated conditions should factor into the equation.
If one is thin, physically active, doesn’t smoke, eats a healthy diet, and has no family history of heart disease, drinking alcohol won’t add much to decreasing risk of cardiovascular disease.
If one doesn’t drink, there’s no need to start. One can get similar benefits with exercise (beginning to exercise if one doesn’t already or boosting the intensity and duration of activity) or healthier eating.
If one is a man with no history of alcoholism who is at moderate to high risk for heart disease, a daily alcoholic drink could reduce that risk. Moderate drinking might be especially beneficial if one has low HDL that just won’t budge upward with diet and exercise.
If one is a woman with no history of alcoholism who is at moderate to high risk for heart disease, the possible benefits of a daily drink must be balanced against the small increase in risk of breast cancer.
If one is already drinking alcohol or plan to begin, keep it moderate—no more than 2 drinks a day for men or 1 drink a day for women. And make sure one gets adequate amounts of folate, at least 400 micrograms a day.
Moderate drinking can be healthy—but not for everyone. One must weigh the risks and benefits. Research has shown that drinking alcohol in moderation can actually be beneficial for health in some surprising ways. So, as with most things in life finding the balance between overindulging and total abstention is the key. Enjoy a drink with friends and family - partake in the joys granted by Dionysus through the tonic that unleashes dance, exhilaration, and sublimity.