David Biello
Scientific American January 30, 2006 New study results bolster the
controversial hypothesis that certain cases of obesity are
contagious. Over the last 20 years, some research has suggested
that certain strains of human and avian adenoviruses--responsible
for ailments ranging from the chest colds to pink eye--actually
make individuals build up more fat cells. Having antibodies to one
strain in particular, so-called Ad-36, proved to correlate with the
heaviest obese people, and in one study, pairs of twins differed in
heft depending on exposure to that virus. Now researchers have
identified another strain of adenovirus that makes chickens
plump.
|
Sarah Graham
Scientific American February 10, 2004 Set against the backdrop of an
increasingly overweight population, the 1994 discovery of the
fat-regulating protein leptin was widely heralded as a boon for
obesity research. The hormone continues to be a focus of
investigation. Findings published online this week by the
Proceedings of the National Academy of Sciences indicate that
increasing leptin levels in the body can fundamentally change the
nature of fat cells—from idle storage containers to
fat-burning machines.
|
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