Raw flour is certainly edible, just not delicious. But if you eat it and get diarrhea, it depends on your personal constitution. If you are afraid of diarrhea, you can barley powder with water into the microwave oven with medium heat for about 5 minutes, also cooked. It will not be a waste of drops ~ ~
If it is too much trouble and good gastrointestinal, you can raw Oh ~ ~ (I often eat raw food)
ps: I really like to eat barley porridge, or barley soup. It's delicious, so try it. But some people say that eating too much barley will hurt the kidneys, I have not yet experienced