Growing up on the farm we would eat raw wheat, oats barley with no side effects. Fresh off the stalk it was chewy tender sort of like pasta that was 30 seconds away from el dente. After sitting in the grainery for a while it got very hard
Mind you, we didn't make a meal of it. In the 60's and 70's I recall 'hippies' soaking and cooking whole wheat berries. I think they even served it at mother earth news eco village restaurants in north carolina.