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Francesco Semprini

Yogi Bear on the cutting edge of obesity research?

Dr. Kevin Corbit, a scientist for the pharmaceutical giant Amgen, is convinced that by studying the behavior of the brown bear — an animal that can weigh up to 500 kilograms (1,100 pounds) and consume up to 58,000 calories daily — we can understand a lot about our own eating habits and identify aspects of obesity that have yet to be fully explored.


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“When I think of obesity, Yogi Bear comes to mind,” Corbit says, speaking in his Washington State University lab. More than a dozen beautiful grizzlies are being hosted here in Pullman, Washington as rather large and cuddly stand-ins for mice and guinea pigs.


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Bears are incredibly strong and sometimes fierce animals, that are also the guardians of precious nutritional secrets that may be able to help solve the human obesity phenomenon.

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In the weeks before their annual hibernation, they hoard honey, salmon and blackberries to gain about 100 kilos (220 pounds), which causes a surge of bad cholesterol and arterial pressure.

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But unlike for humans, their health is unaffected by this gorging period. Their arteries become unclogged when they lose the weight after hibernation, and they’re practically immune to diabetes. These researchers are trying to understand how their bodies work, performing biopsies on fat deposits and keeping close observation of their hearts.


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The bears in this center were born and rescued from Yellowstone National Park, where they had become dangerous to humans. The center takes precautions to ensure the safety of its employees, including keeping the bears behind electric fences, and having them anaesthetised and placed in cages to allow physicians to examine them safely.

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The scientists use honey in bottles to distract them when they’re undergoing certain tests — electrocardiograms (ECGs), for example — for which anaesthesia cannot be used. “It’s of course a long and complex study, but it’s definitely important for research,” says Alexander Kamb, coordinator of the Amgen research department that launched the program two years ago.


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The traditional approaches to obesity study have yielded limited results, and drugs marketed to help people lose weight can only reduce a small percentage of fats from the human body. Brown bears, on the other hand, are able to become obese in a healthy way every year, and still lose a large amount of weight without any adverse health effects, thanks to their faculty to control the hormone insulin.


The secret lies in the genome of these animals, which the researchers are trying to map, Kamb says. “Our goal is to be able to understand how the bears are able to perform such magic.”

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