Having
a beer a few times a week might help women avoid painful rheumatoid arthritis,
a new study suggests.
The
disease, which affects women more than men, is a form of arthritis linked to
immune system dysfunction. According to the Arthritis Foundation, over 1.5
million Americans suffer from the disease, which typically begins in the 20s or
30s.
However,
"long-term, moderate alcohol drinking may reduce future rheumatoid
arthritis development" in women, said lead researcher Dr. Bing Lu, an
assistant professor of medicine at Brigham and Women's Hospital and Harvard
Medical School, in Boston.
Overall,
moderate use of any form of alcohol reduced the risk by about 21 percent, but
moderate beer drinking -- two to four beers per week -- cut women's odds for
the disease by nearly a third, the study found.
The
findings are published in the spring 2014 issue of Arthritis &
Rheumatism.
In
their research, Lu's group tracked the drinking habits of women in two large
studies, the Nurses' Health Study and the Nurses' Health Study II. The first
study began in 1976, and includes more than 121,000 registered nurses. The
second includes more than 116,00 nurses, and started in 1989. Women answered
questions about their health and lifestyle every two years and about diet,
including alcohol consumption, every four years.
Long-term
moderate alcohol drinking appeared to reduce the risk of getting rheumatoid
arthritis, Lu said. But drinking a few beers per week seemed to have the best
effect, providing a 31 percent reduction in risk.
Lu
said his team can't yet explain how beer and other alcohol might reduce a
woman's risk for rheumatoid arthritis. He also doesn't know if the findings
would apply to men. "We don't know for men," Lu said, "but
rheumatoid arthritis is primarily a woman's disease."
The
new study does echo some previous research, noted one expert, Dr. Len Horovitz,
an internist at Lenox Hill Hospital in New York City.
"There
is a correlation between alcohol and a reduced risk of rheumatoid arthritis
over time," he said, citing other studies. However, that doesn't mean that
one necessarily leads to the other -- "there is a correlation [shown
here], not cause and effect," Horovitz said.
Exactly
how a little alcohol may reduce a woman's odds for the joint malady is
complicated, he said. "The mechanism of action is very complex,"
Horovitz said, involving immune system activity and other factors.
Dr.
Daniel Arkfeld, an associate professor of clinical medicine at the Keck School
of Medicine, University of Southern California, Los Angeles, called the
findings "astonishing."
He
also pointed to prior studies that have linked moderate alcohol intake with
lower rheumatoid arthritis risk, but added that none had focused on beer
specifically.
It's
possible that alcohol may work to boost levels of estrogen, which is protective
against rheumatoid arthritis, Arkfeld said.
The
new findings might be especially relevant for someone with a family history of
the disease, added Dr. Scott Zashin, a rheumatologist in Dallas and a member of
the media committee for the American College of Rheumatology.
"The
likelihood of someone developing rheumatoid arthritis is not common,"
Zashin said. "But if you have a family history, your risk increases."
He
said that "patients with a family history might enjoy a beer a few times a
week if there is no other reason not to drink."
But
while imbibing the occasional drink may be good for your health, Horovitz
stressed that excessive drinking is never a good idea. Nor is the new finding a
reason for people who don't drink beer to start doing so, he said.
Arkfeld
offered one more caveat, noting that alcohol does not mix well with certain
rheumatoid arthritis drugs due to the risk of liver effects. So in those who
already have rheumatoid arthritis, checking with your doctor before upping your
alcohol intake is advised, he said.
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