In times of famine they eat dead fish or marine mammals, berries, and graminoid vegetation.

During a study on the animal, one researcher found only 1% of his 270 encounters with Kamchatka brown bears resulted in attack.

[8] The first Europeans who went to Kamchatka in the 19th century, although surprised by the number and size of bears there, observed that they were relatively harmless, compared to their Siberian counterparts.

[9] However, in July 2008, a platinum-mining compound in the Olyutorsky District of Kamchatka Krai was besieged by a group of 30 starving bears who killed two guards.

The recreational hunting of Kamchatka Brown Bears has led to endangerment of the species in Russia[3]