* Different Metabolism: Bears have a very different metabolism than humans. Their bodies process sugar and alcohol differently.
* High Tolerance: They have a much higher tolerance for sugar and alcohol than humans. A large amount of sugar or alcohol would be needed to have any noticeable effect on a bear.
* Focus on Calories: Bears are primarily concerned with gaining calories to survive, especially in preparation for hibernation. They aren't interested in the "intoxicating" effects of alcohol.
While bears might enjoy eating blackberries and other fruits, they won't experience a "drunk" feeling like humans do.