Bears with diets that are based largely on human food are hibernating less, which is causing them to age quicker biologically, according to a new study published in Nature Scientific Reports.

A research team tracked 30 black bears near Durango, Colo., between 2011 and 2015, paying close attention to their eating and hibernation habits. The researchers found that bears who foraged on human food hibernated less during the winters — sometimes, by as much as 50 days — than bears who ate a nat