More Than Enough for a Human Being, and Even More Than Enough for a Pig!
Here’s a rather dry and technical article that describes the amount of “available protein,” as opposed to “crude protein,” in the foods that wild mountain gorillas eat.
The mountain gorillas in this study were getting more than enough protein, mainly because they were eating so many leaves. Although leaves are low in calories, a substantial proportion of those calories comes from protein. If gorillas eat enough leaves to get enough calories, the protein takes care of itself. A leafy diet is so rich in protein that the gorillas can afford to snack on some low-protein fruit.