Do you have a link to this claim? Plants are carbohydrates. Carbohydrates break down into glucose. You are saying that their digestive system is able to convert glucose into amino acids. I've read the explanation how amino acids can be converted to glucose but not vice versa.
I found this:
Even if you were determined to shovel all that vegetation in your mouth, it wouldn't do you much good. Threads on Reddit's AskScience forum have probed the gorilla question, revealing that the apes' intestines digest foods differently to humans'.
Gorillas have gut bacteria that's better at both converting cellulose (plant matter) into energy and synthesising amino acids, which supercharge all that muscle mass.
And
3.Gorillas Can Easily Use Plant Fibers By Digesting Cellulose
There is one more thing that is noticeable in Uganda Destinations like Bwindi forest park & its nearby areas that these Gorillas can also digest cellulose that allows them to completely use the plant fibers. Now when this fact is compared to human vegetarians & other animal species that are herbivorous, digesting cellulose is completely impossible. Clearly stating that these mountain gorillas are amazing in numerous ways that we can’t even imagine.
imagine.
4.They Have Unique Digestive System For Fixing More Protein In Their Body
Through your observations in Uganda Safari, you will also come to know through the guides and doctors that these gorillas possess a digestive tract which is amazingly long & capable of converting cellulose into Omega-3 fatty acids. This variant of fatty acid is very important for the health of their brain as well as the health of their central and peripheral nervous system. Moreover, this fatty acid also helps in supplying the coating of the plasma membrane of these gorillas. As far as this membrane is concerned, it allows certain nutrients to flow in & out of the cells smoothly.