Rice does not contain gluten, matter of fact, it's one of the few grains those with celiac disease can have. Also, doesn't the brown rice still have more of the fibrous hull than white rice? That extra bit of fiber coating on the grain could be why it just goes through you. Is this a recent development?
Living in the Republic of Texas minus a gallbladder, appendix, uterus, and 18" of colon; but living with my wonderful husband, 2 dogs, 1 cockatiel, and 2 gold fish.