Genesis 9: Then God blessed Noah and his sons, saying to them, ‘Be fruitful and increase in number and fill the earth. 2 The fear and dread of you will fall on all the beasts of the earth, and on all the birds in the sky, on every creature that moves along the ground, and on all the fish in the sea; they are given into your hands. 3 Everything that lives and moves about will be food for you. Just as I gave you the green plants, I now give you everything.
Text from biblegateway.com, NIV UK version .
Or maybe meat was a better food source than veggies. Or maybe there was a difference in lifestyle between gatherer and hunter. Or maybe there were a thousand other reasons, and meat/survival were never linked and are purely co-incidental. We'll never know.