Oats were processed for food 32,000 years ago, in southern Italy. (Cite.) This presents a bit of challenge to some popular views of the paleolithic diet. Huw Barton, a bioarchaeologist at the University of Leicester states it well:
People ate what they could get their hands on. Eating is surviving.
The dilemma of what kind of diet to practice is a modern one. We live in a wonderful time and place that we can get a box of rolled oats or a carton of eggs or can of sardines from a nearby grocery, for not much effort or lucre. When you live off the land, your choice is narrowed. What you eat depends on where you live and what season it is and very much on opportunity. Now, me? It’s oats and walnuts and blueberries for breakfast.