Whole wheat flour: healthy snack, junk food, or just plain weird?

For the most part, we let Weston eat what he wants. We have mostly healthy things in the house, and he can choose to eat, or not eat, whatever there is. He will eat almost anything and gets plenty of fruits, veggies, oatmeal, brown rice, yogurt, cheese, and milk. Sometimes, he wants to eat flour, and I let him, though I try to limit it because, well, eating flour seems really strange to me. Today, he has eaten three bowls of flour, probably a total of a cup. I am trying not to freak out about the flour, because I remember when I was little, I would mix shortening and sugar, or shortening and coffee, and eat that. But my sister and I would also roll up coffee or tea in paper and set it on fire so we could pretend we were smoking, so I'm not sure that what I did is a very good criterion for determining weird or normal. If there are any nutritionists or actual normal people here, please let me know: will the flour eating scar him, or just glue his mouth shut for a while? Because I could definitely live with that.