cynicow.com

a team tried that experiment at Yerkes by installing feeders with a constant supply of banana-flavored pellets…Once these foods were available, the low-status monkeys promptly developed an appetite. They began eating significantly more calories than their social superiors. While the dominant monkeys dabbled in the sweet, fatty pellets just during the daytime, the subordinate monkeys kept scarfing them down after dark.

Eating Junk Food May Help Stressed-Out Monkeys Cope - New York Times.