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Colder, Darker Climates Increase Alcohol Consumption

For Journalists

Erin Hare, Ph.D.
Manager, Science Writing
412-738-1097
HareE@upmc.edu

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Pitt Health Sciences UPMC

11/14/2018

PITTSBURGH – Where you live could influence how much you drink. According to new research from the University of Pittsburgh Division of Gastroenterology, people living in colder regions with less sunlight drink more alcohol than their warm-weather counterparts.

alcohol and weather play

The study, recently published online in Hepatology, found that as temperature and sunlight hours dropped, alcohol consumption increased. Climate factors also were tied to binge drinking and the prevalence of alcoholic liver disease, one of the main causes of mortality in patients with prolonged excessive alcohol use. 

 

“It’s something that everyone has assumed for decades, but no one has scientifically demonstrated it. Why do people in Russia drink so much? Why in Wisconsin? Everybody assumes that’s because it’s cold,” said senior author Ramon Bataller, M.D., Ph.D., chief of hepatology at UPMC, professor of medicine at Pitt, and associate director of the Pittsburgh Liver Research Center. “But we couldn’t find a single paper linking climate to alcohol intake or alcoholic cirrhosis. This is the first study that systematically demonstrates that worldwide and in America, in colder areas and areas with less sun, you have more drinking and more alcoholic cirrhosis.”

 

Alcohol is a vasodilator – it increases the flow of warm blood to the skin, which is full of temperature sensors – so drinking can increase feelings of warmth. In Siberia that could be pleasant, but not so much in the Sahara.

 

Drinking also is linked to depression, which tends to be worse when sunlight is scarce and there’s a chill in the air.

World map drinking release

Using data from the World Health Organization, the World Meteorological Organization and other large, public data sets, Bataller’s group found a clear negative correlation between climate factors – average temperature and sunlight hours – and alcohol consumption, measured as total alcohol intake per capita, percent of the population that drinks alcohol, and the incidence of binge drinking. 

 

The researchers also found evidence that climate contributed to a higher burden of alcoholic liver disease. These trends were true both when comparing across countries around the world and also when comparing across counties within the United States. 

US maps release

“It’s important to highlight the many confounding factors,” said lead author Meritxell Ventura-Cots, Ph.D., a postdoctoral researcher at the Pittsburgh Liver Research Center. “We tried to control for as many as we could. For instance, we tried to control for religion and how that influences alcohol habits.” 

 

With much of the desert-dwelling Arab world abstaining from alcohol, it was critical to verify that the results would hold up even when excluding these Muslim-majority countries. Likewise, within the U.S., Utah has regulations that limit alcohol intake, which have to be taken into account. 

 

When looking for patterns of cirrhosis, the researchers had to control for health factors that might exacerbate the effects of alcohol on the liver—like viral hepatitis, obesity and smoking.

 

In addition to settling an age-old debate, this research suggests that policy initiatives aimed at reducing the burden of alcoholism and alcoholic liver disease should target geographic areas where alcohol is more likely to be problematic.

 

Additional authors on this study include Ariel Watts, B.S., Neil Shah, M.D., Peter McCann, M.D., and A. Sidney Barritt IV, M.D., all of the University of North Carolina at Chapel Hill; Monica Cruz-Lemini, M.D., Ph.D., of the Universidad Nacional Autónoma de México at Juriquilla; Jose Altamirano, M.D., of Hospital Quirónsalud in Barcelona; Juan Abraldes, M.D., from The University of Alberta; Nambi Ndugga, M.P.H., of Harvard; and Anant Jain, M.D., Samhita Ravi, and Carlos Fernández-Carrillo, M.D., Ph.D., all of Pitt. 

 

This research was supported by National Institute on Alcohol Abuse and Alcoholism awards U01AA021908 and U01AA020821, the Mexican National Council for Science and Technology and the Spanish Association for the Study of the Liver.

 


VIDEO INFO:

 

Title: Animated Summary of Climate Effects on Alcohol Consumption
Caption: Using worldwide climate data, a University of Pittsburgh study found that people are more likely to drink excessively or experience alcoholic liver disease when they live in colder regions with fewer sunlight hours.
Credit: Wrecking Crew Media

PHOTO INFO: (click images for high-res versions)

 

Image #1

Title: World Map of Drinking and Climate Patterns
Caption: Liters of Alcohol Intake Per Capita (top), Average Temperature (bottom left) and Average Amount of Sunlight (bottom right)

 

Image #2

Title: U.S. Map of Drinking Patterns
Caption: Incidence of all (top) and binge (bottom) drinking across counties of the United States

 

Credit both: Ventura‐Cots et al. (2018). Hepatology, doi: 10.1002/hep.30315. Copyright John Wiley and Sons.

 

 

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