The gorilla's diet. They have to eat a lot of vegetables like leaves, stems, bamboo, bark, wood, and roots this is the gorillas' s diet. Also, 85% of their diet is made up of that. Gorillas have gut bacteria that are better at converting cellulose. Gorillas don't eat meat they only eat plants and fruits. A male gorilla eats 30 kg of plants every day and the female is 18kg every day.