A Great Smoky Mountains National Park spokesman says a lack of wild food in the park this year has caused hungry bears to become increasingly brazen in their attempts to take people's food.On Monday, a bear crawled in through a Gatlinburg woman's open car window. In a separate incident, a woman in the Smoky Mountains said the presence of a doughnut caused a bear to break through her windshield.Park spokesman Brent Everitt told a local TV station that bears are preparing to hibernate, causing them to break into cars and cabins in the search for food.Everitt said that cherries, one of the bears' primary food sources, didn't appear in the park in August.He said there also has been a lack of acorns and nuts spotted in the park.