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Well you need a lot of protein to gain/maintain muscle mass which you can only get it from meat. (https://burnfatnotsugar.com/p2e/AboutP2E/image27o.JPG)

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Proteins are definitely not only in meats. Beans have more protein per weight than meats. Even your diagram suggest not only meats are high in nutrients.

What about bio-availability of that protein?

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