Will polar bears survive in a warmer world?   New evidence says their numbers are likely to dwindle. 

As polar bears lose habitat due to global warming, biologists say, they will be forced southward in search of alternative sources of food, where they will increasingly come into competition with grizzly bears.    Polar bears probably evolved very rapidly in response to glacial climates during the ice ages but rapidly on an evolutionary scale is not a realistic timeline for climate change.

Researchers at the Faculty of Life Sciences (LIFE), University of Copenhagen have published the results of the world's largest diet study, called called Diogenes.

Like anything obvious, the formula is simple but the application can be difficult for those who already have a weight problem; if you want to lose weight, you should maintain a diet that is high in proteins with more lean meat, low-fat dairy products and beans and fewer finely refined starch calories such as white bread and white rice.

Maintaining that diet, you can eat until you are full without counting calories and without gaining weight.