I have a personal idea about the nature of the Mesolithic diet derived from stories in the Old Testament which was written about 6000BC, but which we know was based upon even earlier myths and oral traditions. For me, the Garden of Eden story is actually a mythologised history of the Mesolithic from the perspective of Prehistoric peoples.
So in Genesis Book 2 (King James) the fist line goes:
'Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.'
So they place fish first, then birds, then beasts and then insects etc and this could be indicative of the relative importance of hunting practices to local diets. The list is repeated several times in that order.
In Chapter 3 there's the line:
And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat.
Which I believe to be representative of foragers gaining knowledge of plants for cultivation- a revolution that changed everything, that changed people from subsistence gatherers (a practice at least 200,000 years old to our species) into early farmers with that incredible ability to create a food surplus. I don't think it can be undervalued how big a game changer this was.
However, it doesn't seem as though the authors of the Bible were very happy about becoming farmers, even with it's new possibilities as they write:
Thou shalt not eat of it: cursed is the ground for thy sake; in sorrow shalt thou eat of it all the days of thy life.
Thorns also and thistles shall it bring forth to thee; and thou shalt eat the herb of the field;
In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return.
There's a great wistful sadness to these lines. An admission of the high price paid for the Neolithic Revolution. Cultivating wild progenitors of wheat must have been backbreaking and risky compared to the relative comfort of the established lifestyle. The loss of freedom of movement, the breakup of the family group and the established way of life must have been extremely unnerving for these early pioneers and I think it's something we still feel deeply today.
Anyway, I offer this up because often when I chat to people about it it's something they've never considered before and it's something I find interesting to think about. It gives me huge respect for the authors of the Old Testament because it's something I relate to alongside them, despite the vast time gap.