The northern white-cheeked gibbon is arboreal in habits, and primarily herbivorous, feeding mainly on fruits, with some leaves, buds, and flowers. However, up to 10% of their diet may be composed of insects and other small animals.
In the natural habitat of the northern white-cheeked gibbon, their diet consists mainly of plants, including fruits, leaves, buds, and flowers. However, they also have a secondary source of nutrition from insects and other small animals, which can make up to 10% of their total food intake.