The human brain did no grow larger and gain intelligence until it ate meat.
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Do you believe that the first human or humans was/were conceived by, borne by, and born to, non-human primates?
You appear to be articulating a tenet of the Theory of Evolution, so I thought I’d ask for clarification.
No, we are Genetically Modified Organisms who then adapted through hybridization of genes to further the best attributes of survivability.
Just as plants hybridize to better survive a particular environment. Even now some families lines have huge heads, others have small heads. Some have intelligence some do not. All dictated by how much meat was eaten through the generations.
I do not believe in evolution, but I do believe in GMO and hybridization of the GMOs towards genetic survival of the fittest.