[escapee]

that is a great big, fat-laden, enormously profitable lie that has been swallowed hook, line, and pork chop.

Animal protein provides bio-available iron and helps the absorption of Iron, zinc and other essential minerals.

A Vegetarian Diet Rich in Soybean Products Compromises Iron Status in Young Students -- Shaw et al. 125 (2): 212 -- Journal of Nutrition

The iron status of young Chinese Buddhist vegetarians (23 men and 32 women) and nonvegetarian students (20 men and 39 women from a medical college) was investigated by dietary assessment of iron intake and hematological measurement of biochemical indices including hemoglobin, plasma iron, transferrin, transferrin saturation and plasma ferritin.

Correlation between plasma ferritin concentration and years of vegetarian practice in vegetarian men was marginally significant (r = -0.38, P = 0.077). We conclude that a vegetarian diet that is rich in soybean products and restricted in animal foods is limited in bioavailable iron and is not adequate for maintaining iron balance in men and women ( despite higher iron intake by the vegetarian group) .

Animal products ( including larva and insects consumed by gorilla ) provide B12 and Vitamin A. Nuts and legume do not.

Dietary Animal Protein has been associated with higher bone mineral density compared to vegetable source ( assuming that Calcium, Vitamin D and etc are also at adequate level )
Protein Consumption and Bone Mineral Density in the Elderly : The Rancho Bernardo Study -- Promislow et al. 155 (7): 636 -- American Journal of Epidemiology

This is why our ancestor choose an omnivore diet. Should you decide to be different, a daily supplement of certain nutrients (eg: B12 ) may be required.

gorilla has no protein deficiencies. They obtain all the amino acids they need from the source—the plant kingdom.

Not 100% true

Unlike human, Gorilla has the ability to synthesize essential amino acids , furthermore, Gorillas aint 100% vegans, you would understand more by perusing below .

What Can the Diet of Gorillas Tell Us About a Healthy Diet for Humans?

One misconception about the gorilla diet is that it contains no animal products. On the contrary, all of the great ape groups take in some animal protein, whether overtly or inadvertently, by consuming insects, insect eggs and the larvae that nest on the plants and fruits they eat. In her pioneering work on chimpanzees, Jane Goodall discovered to her amazement, and to the amazement of the rest of the world, that chimpanzees kill and eat monkeys and make a tool to extract termites from their hills (homes), and that they went to considerable effort to obtain these foods. It is also significant that meat is the only food they share with other chimpanzees.

All monkeys, lemurs and apes are classified as vegetarians and/or fruitivors, but they consume a small amount of animal protein by unconsciously eating the small insects, their eggs and larvae on the plant foods they select to eat. The National Zoo in Washington, D.C. tried to breed the near extinct fruitivorian South American golden marmoset in captivity with no result, but when a little animal protein was added to their diet, they began to breed, which proves that they require a small amount of animal protein to be healthy and reproduce.

Unlike humans, the digestive tract of gorillas is equipped to manufacture the essential amino acids and other vital nutrients.