Case study 2 has reported severe bloating daily, intolerances to gluten (not related to celiac disease according to tests), and sensitivity to lactose, garlic, and onion. They had regular fatigue and skin issues that accompanied their gut issues for most of their young adult life.
Case study 11, who had no celiac disease and was not officially diagnosed with lactose intolerance, had to restrict gluten and dairy for three years due to severe discomfort that was caused upon consumption.