The increase in the number of Celiacs or Gluten-Intolerants in this country FINALLY being identified, supports this statement. In Europe, gluten sensitivity is a test commonly administered. In the United States, it is hypothesized that 1 in 200 suffer some degree of gluten intolerance due, in part, to the 'milling' techniques started back during the early 1900's.
I'm one of them, and probably developed a form of rheumatoid arthritis because of it. My digestive problems have disappeared since going gluten-free. (Thanks to Remicade, my arthritis symptoms have also vanished). Next up, a low-carb diet.