I would also add that, by this definition, any animal product eaten is processed - even eggs - which are cracked and then usually cooked. Ground beef is extremely processed - having been butchered and then fed through a grinder.

You can theoretically grow your own wheat and grind your own flour. If you can do it yourself without a food factory and secret ingredients, then I don't think it fits any reasonable definition of 'processed'.

In my mind grinding is processing. It is being processed so we can make something something else out of it. Would you eat it on its own?

I broadly wipe that anything that can't be done with ones hands is processed. But that opens the question if cooking meat is considered processing.

I can't see prehistoric man grinding wheat to make a meal.

Cooking meat causes chemical changes - maillard reaction. http://en.m.wikipedia.org/wiki/Maillard_reaction

Many low tech cultures use carbs obtained from crushing or pulping grains. The reason they don't use wheat is not because of the need for grinding but because of the need for agriculture.

To be pedantic, chemicals are added to fortified and enriched flour... perfectly harmless chemicals that were lost in the milling process.

It's not surprising that people think you're claiming that milling flour is "processing" it, or that you think gluten is a result of whatever people are doing to flour.