In some cases, going grain-free can control or even eliminate the symptoms of certain autoimmune conditions including Hashimoto's thyroiditis and rheumatoid arthritis. Indeed, this is the reason that medical professionals most commonly advise a grain-free approach. For example, the gluten in many grains affects people with celiac disease, leading to severe nutritional deficiencies and other digestive issues. Similarly, going grain-free has been shown to help control the symptoms of IBS and maybe even ulcerative colitis. Learn more about the autoimmune protocol in my article on the AIP Diet for Beginners.