THURSDAY, March 1 (HealthDay News) — Shark fins contain high levels of
a neurotoxin called BMAA, which is linked to neurodegenerative diseases in
humans such as Alzheimer’s and Lou Gehrig’s disease (amyotrophic lateral
sclerosis), according to a new study.
The findings suggest that people who eat shark fin soup and shark
cartilage pills may be at significant risk for these diseases, the
University of Miami researchers warned.
The scientists tested seven shark species — blacknose, blacktip,
bonnethead, bull, great hammerhead, lemon and nurse — in waters
throughout South Florida.
“The concentrations of BMAA in the samples are a cause for concern, not
only in shark fin soup, but also in dietary supplements and other forms
ingested by humans,” study co-author Deborah Mash, director of the
University of Miami Brain Endowment Bank, said in a university news
release.
The new study was published Feb. 21 in the journal Marine
Drugs.
In a study published in 2009, Mash and her colleagues found that
patients dying of Alzheimer’s disease and amyotrophic lateral sclerosis
had unusually high levels of BMAA in their brains, up to 256 nanograms per
milligram (ng/mg). In comparison, healthy people had only trace amounts or
no BMAA in their brains.
The new study found BMAA levels of between 144 and 1,836 ng/mg in the
shark fins.
Many shark species are on the road to extinction because of the demand
for shark fin soup, the authors said. “Because sharks play important roles
in maintaining balance in the oceans, not only is shark fin soup injurious
to the marine environment, but our study suggests that it is likely
harmful to the people who are consuming them,” co-author Neil
Hammerschlag, director of the university’s marine conservation program,
said in the news release.
More information
The U.S. National Library of Medicine has more about neurodegenerative diseases.
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