The chromosomes you inherit consist of proteins called histones, which unwind to allow DNA to be read -- think of DNA like a computer code that uses 4 different chemical bases, which are recognized by letters A, C, G, and T. Your genes are strings of DNA which codes for polypeptides(chemically linked amino acids). The order of the aforementioned letters determine which polypeptide is made, and stringing different polypeptides together produces different proteins. This is what gives us our various different traits. Even further, the epigenome determines whether or not a string of DNA is read, which obviously differs between people. Going further with this, there are other things to consider like genetic distance, populations, etc; Now you should see how frivolous it is to try to base your diet around what your ancestors ate many, many years ago; or even more absurd -- what a different species eats.
Your post is merely an argument from ignorance(fail to recognize how complex DNA is) using tautology.
P.S. Grok is a fictitious character.