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 Researchers examined health survey data on more than 333,000 U.S.
adults, following them for an average of about eight years to see
how their drinking habits influenced their survival odds.
Compared with people who never had a drop of alcohol, light to
moderate drinkers were more than 20 percent less likely to die early
of any cause, or of heart disease in particular, the study found.
Heavy drinkers and binge drinkers, however, were at least 10 percent
more likely to die from any cause during the study, and they had at
least 20 percent higher odds of an early death from cancer in
particular.
“If alcohol is consumed, it should be consumed in moderation,” said
lead study author Dr. Bo Xi of the School of Public Health at
Shandong University in China.
Heavy drinking has long been linked to a variety of medical problems
including liver disease, heart disease and certain cancers. But
previous research has offered an inconclusive picture of the
survival odds associated with light or moderate drinking.
The current analysis attempts to tackle two issues that have
contributed to inconsistent results in much of the earlier research:
`abstainer bias’ and `sick quitter bias.’
Many other studies compared moderate drinkers to people who
currently didn’t drink, making it impossible to separate people who
stopped drinking due to addiction or other health reasons from
people who were lifelong abstainers.
To exclude `sick quitters,’ the current study left out people who
died in the first two years of follow-up. To avoid `abstainer bias,'
researchers created separate categories for adults who never drank
at all and for ex-drinkers.
They sorted adults into six categories for the current study:
lifetime abstainers; people who have always had alcohol on rare
occasions; ex-drinkers; current light drinkers who have fewer than
three drinks a week; moderate drinkers (more than three drinks a
week but fewer than 14 for men or 7 for women); or heavy drinkers
(more than 14 for men or 7 for women).
During the study period, 34,754 people died, including 8,947
fatalities from cardiovascular diseases and 8,427 from cancer,
researchers report in the Journal of the American College of
Cardiology.
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Male heavy drinkers had a 25 percent increased risk of death during
the study and 67 percent higher odds of deaths from cancer than men
who never drank. These differences weren’t statistically meaningful
for women, however.
The study wasn’t a controlled experiment designed to prove whether
or how heavy drinking might hasten death or light to moderate
alcohol consumption might help people live longer. Researchers also
relied on survey participants to accurately recall and report how
much they drank.
Scientists aren’t sure why light or moderate drinking might have a
protective effect, said Dr. Eugene Yang of the University of
Washington School of Medicine.
“It may improve the health of your blood vessels by reducing
inflammation and your ability to form blood clots, increase levels
of good cholesterol, and promote antioxidant pathways,” Yang, who
wasn’t involved in the study, said by email.
Even if it doesn’t explain why drinking a little might lead to a
longer life, the study does confirm that the risk of death tied to
alcohol use increases sharply when people regularly drink more than
they should, Dr. Giovanni de Gaetano, author of an accompanying
editorial and a researcher at Istituto Neurologico Mediterraneo
Neuromed in Pozzilli, Italy, said by email.
“The clear message is to avoid excessive drinking, either on a
regular basis or even on any one day, to reduce risk,” Dr. Gregory
Marcus, a researcher at the University of California, San Francisco,
who wasn’t involved in the study, said by email. “Those prone to
alcoholism or addiction are also likely best served with alcohol
abstinence.”
SOURCE: http://bit.ly/2w3RpVv Journal of the American College of
Cardiology, released August 14, 2017.
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