There Is No "Safe" Amount of Alcohol

 Moderate daily drinking will not improve your health.

As a growing number of addiction and alcohol consumption researchers have been pointing out, the notion of a safe and even beneficial level of daily drinking is outmoded and in error. In an article published in Lancet, researchers offer strong evidence against the theory, based on data from the Global Burden of Diseases, Injuries, and Risk Factors Study of 195 countries and territories.

 In an accompanying commentary, researchers note that the data "clearly demonstrate the substantial, and larger than previously estimated, contribution of alcohol to death, disability, and ill health, globally." Moreover, the Chief Medical Officer of the UK announced that there is “no safe level of alcohol consumption” and suggested that policies designed to decrease daily drinking should receive top priority.


(See my post from 2015 predicting the death of the "moderate drinking" meme.)

Moderate Drinking Doesn’t Help Your Heart

Mendelian meta-analysis and the alcohol “flush” allele.

Less than a year after the massive Mendelian randomization meta-analysis published in the British Medical Journal, a group of researchers recently wrote an editorial in the journal Addiction, which would seem to put a lid on the matter:

The foundations of the hypothesis for protective effects of low-dose alcohol have now been so undermined that in our opinion the field is due for a major repositioning of the status of moderate alcohol consumption as protective…. Health professionals should not recommend moderate alcohol consumption as a means of reducing         cardiovascular risk for patients. At the policy level, the hypothesis of health benefits from moderate drinking should no longer play a role in decision making.

To recap: In the Mendelian meta-analysis, drinkers with a genetic variant linked to the so-called alcohol flush reaction, which leads to lower consumption among those who drink, also correlated with a decreased risk of cardiovascular disease. “Carriers of the rs1229984 A-allele had lower levels of alcohol consumption and exhibited lower levels of blood pressure, inflammatory biomarkers, adiposity measures, and non-HDL cholesterol, and reduced odds of developing coronary heart disease, compared with non-carriers of this allele.”

But as it turned out, this relationship only held for drinkers, not for abstainers.

Why, then, have so many epidemiologists agreed for several decades now that “moderate” alcohol intake has a protective effect against heart diseases? According to the editorial authors—drug researchers from Australia, Canada, the U.S., and Sweden—earlier research tended to use “abstainers” as the key reference group to which drinkers were compared. Studies that separated former drinkers and occasional drinkers from abstainers got different results—they didn’t show significant protection correlating with moderate alcohol consumption. The theory, say the researchers, is that non-addicted drinkers spontaneously reduce their alcohol intake with age and medical concerns. Some of these people with a declining health profile are counted as “abstainers.” But when former and current drinkers are combined, then compared with life-long abstainers to address selection bias, “the observed disparity in health status between abstainers and low-dose drinkers was eliminated.”

But it’s not quite over. Michael Rioerecke and Jurgen Rehm at the Center for Addiction and Mental Health in Toronto, argue in another Addiction editorial that there are still a few things unaccounted for: The allele in question is assumed to be randomly spread throughout the population, which may or may not be true, especially since allele carriers are relatively rare in several European countries. The allele is also assumed to be mediated by average alcohol intake. Binge drinking, which allele carriers presuming engage in less, is not assessed in the study.  In short, they write, “we do not know if the average level of alcohol intake of the allele carriers within the strata of average consumption was indeed lower than that of the non-carriers.” Nonetheless, even Rioerecke and Rehm concede that the evidence continues to look promising for this revision of conventional drinking wisdom. More than 100 studies have shown relatively stable associations between alcohol and heart disease, and absent a new breakthrough method of epidemiological study, this one stands a good chance of holding firm.

Graphics credit: http://www.keyingredient.com/

Moderate Drinking: The Debate Continues

New study says it’s the lifestyle, not the alcohol.

Ever since the first studies showed modest statistical health benefits for people who drank a light to moderate amount of alcohol, the debate has bounced back and forth among researchers. Now an Italian study of more than 3,000 older adults, published in the Journal of the American Geriatrics Society, claims that it is the moderate lifestyle of drinkers, and not the alcohol itself, which helps prevent functional decline as we age.

After controlling for body weight, level of physical activity, education, and income, Cinzia Maraldi and coworkers in the Department of Clinical and Experimental Internal Medicine at the University of Ferrara pointed the finger at lifestyle characteristics—primarily weight control and exercise.

The researchers did not dispute the finding that moderate levels of alcohol intake can lower the risk of cardiovascular disease--but lead author Maraldi said in a press release that “the benefit of alcohol intake on other health-related outcomes is less convincing.”

Maraldi said the positive effects of moderate alcohol on physical aging and cognitive impairment in the elderly may be only apparent, “because life-style related characteristics seem to be the real determinant of the reported association.”

The research follows earlier U.S. studies suggesting much the same thing. A finding that had become common folk wisdom—with perhaps a little nudge from the alcoholic beverage industry--is now openly disputed by scientists.

“The moderate drinkers tend to do everything right,” said sociologist Kaye Middleton Fillmore, in a New York Times article by Roni Caryn Rabin. “They exercise, they don’t smoke, they eat right and they drink moderately.” In the same article, an Oakland cardiologist said: “It’s very difficult to form a single-bullet message because one size doesn’t fit all here, and the public health message has to be very conservative.”

In the New York Times article, Dr. Tim Naimi of the Centers for Disease Control and Prevention said: “The bottom line is there has not been a single study done on moderate alcohol consumption and mortality outcomes that is a ‘gold standard’ kind of study—the kind of randomized controlled clinical trial that we would be required to have in order to approve a new pharmaceutical agent in this country.”

Photo Credit: Rhodes University


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