Polar Bears:
Polar bears feed mainly on ringed and bearded seals. Depending upon their location, they also eat harp and hooded seals and scavenge on carcasses of beluga whales, walruses, narwhals, and bowhead whales.When other food is unavailable, polar bears will eat just about any animal they can get, including reindeer, small rodents, seabirds, waterfowl, fish, eggs, vegetation (including kelp), berries, and human garbage.

Bears:
The food bears eat varies with where they live and the season of the year. For example, bears eat honey, if it is availablein fact, they may even eat the bees. In the spring, before bears can forage for fruit or berries, bears dig for roots, graze on young grass shoots, or claw insect larvae from inside rotten trees.
Bears eat a great volume of food and pass it rapidly through their digestive tract. They eat certain plants when the plants are at their peak nutritional value
The usual diet of grizzlies and black bears consists of nuts, roots, berrie ...more

Polar bears feed mainly on ringed and bearded seals. Depending upon their location, they also eat harp and hooded seals and scavenge on carcasses of beluga .When other food is unavailable, polar bears eat reindeer, small rodents, seabirds, ducks, fish, eggs, vegetation (including kelp), berries.........(taken from Google).............

Food of polar bear-Flesh
Food of bear- Honey and vegetables.