Some humans have a similar response. Studies show that if you cause stress in people in the lab—by making them participate in a mock job interview, for example—and then offer them a buffet of snacks, they may be more inclined to graze on chocolate bars than carrot sticks. According to Laugero, such effects are not universal, but stress affects diet in some form in about 80 percent of the population. "It is possible that some of it is just the reward-based association," Laugero explains, "but I think with food, there is definitely a metabolic basis. Having a bowl of ice cream when we're stressed can actually be adaptive. But it's the repeated nature over time that can be absolutely maladaptive."