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By Catholic Online (NEWS CONSORTIUM)

5/5/2014 (1 year ago)

Catholic Online (www.catholic.org)

How do these husky white bruins remain healthy on such a diet?

Polar bears - those white-hued iceberg living bruins that appear to be poster children for global warming, are remarkably healthy - by subsisting on a diet of fat, fat and even more fat. How can these sturdy survivors, who swim great lengths of water and endure unconscionably cold conditions continue to thrive on a diet like that? Researchers have a surprising answer to that question -

A baby polar bear drinks milk that's 27 percent fat - small change compared to the two percent us humans drink out of a carton.

A baby polar bear drinks milk that's 27 percent fat - small change compared to the two percent us humans drink out of a carton.

Highlights

By Catholic Online (NEWS CONSORTIUM)

Catholic Online (www.catholic.org)

5/5/2014 (1 year ago)

Published in Health

Keywords: Polar bears, fat, diet, longevity, genes, evolution


LOS ANGELES, CA (Catholic Online) - The polar bear's white fur is a big help as it helps them blend in with ice floes to sneak up on their breakfast, lunch and dinner. Their body fat also helps them to stay warm.

More importantly, polar bears have genes that help them live on a diet that's overloaded with fat. This helps them withstand the sorts of human diseases that typically come with a fat-heavy diet.

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A baby polar bear drinks milk that's 27 percent fat - small change compared to the two percent us humans drink out of a carton. Adults feed mostly on blubbery seals which allows them to build up so much insulation that bears can be 50 percent fat by weight.

It's highly unlikely that polar bears could survive as a species if they hadn't developed an ability to live on a high-fat diet. So what's their secret?

Researchers say they've found clues in the genes of polar bears. An international team has taken a close look at the polar bear genome to understand how this species split off from its close cousin, the brown bear.

The genes related to fur color have mutated, as expected. The changes occur in a genetic region that's linked to a human condition called Chediak-Hikashi syndrome, which causes loss of pigment in the skin and eyes.

These genes seem key to polar bear evolution are gives an indication as to how these animals handle their fatty diet. A gene called VCL is linked to heart disease in humans. In polar bears, this gene has undergone a dramatic evolution, compared with the VCL gene in the brown bear.

There's something else that's endangering this species, however. The sea ice that polar bears use as a platform to catch seals is shrinking, threatening the species' existence.

"Based on this evidence, we argue that potentially important reorganization of the cardiovascular system has taken place in polar bears since their divergence from brown bears," researchers write.

The rapid genetic changes might also have been spurred on by the long-distance swimming that polar bears do. Bears that have cardiovascular genes that help endurance are presumably at an advantage, so those genes are more likely to be passed on to future generations.

The report suggests that polar bears evolved quite recently - just 400,000 years ago. That may prove to be contentious. Another puts the split between brown bears and polar bears at four million to five million years ago.

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