Barley, Oat, Rice, Rye and Wheat in their freshly harvested state can be eaten like normal food. That seems to be unintended, as eating freshly harvested grains in 1.7.10 is impossible.

• TFC Version: 0.26.6.97

This was intentional - they have severely reduced hunger and nutritional values to typical grains to compensate for the lack of processing.