Our ancestors in the palaeolithic period, which covers 2.5 million years ago to 12,000 years ago, are thought to have had a diet based on vegetables, fruit, nuts, roots and meat.
Cereals, potatoes, bread and milk did not feature at all. It was only with the dawn of agriculture (around 10,000 years ago) that our diets evolved to include what we think of as staple foods now.
But why do they put meat at the bottom of that list??
Good quote though:
"Palaeolithic man may have died earlier than we do now, but he didn't die of bad nutrition."