My friend Patty joined a local gym to support a friend, and as part of their nutrition program she eliminated all processed carbs, most of which contain gluten. To her surprise, she lost 10 pounds almost instantly, her concentration improved, she had more energy, and most importantly, her chronic stomachache went away. To my dismay as a doctor, she had never complained to me about the stomachache. She told me that she had experienced bloating and discomfort with eating for so many years that it had become totally normal to her. But when it went away, she couldn't stop telling people about how it had transformed her life!
Interesting, all of her children also have "bad stomachs," as they like to call it. Her daughter was convinced she had celiac disease, but the test was negative, so they continued to encourage her to eat it. Her son had growth delay and also suffered from chronic stomach issues. I recommended that she consider a gluten-elimination trial for them as well, to see if it improved their digestive suffering.