For people with celiac disease or gluten sensitivity, wheat causes major digestive problems. This includes bloating, gas, diarrhea and stomach pain (8, 9). Wheat is also a major source of FODMAPs, which can cause digestive problems in many people (10, 11). What to eat instead: There are many gluten-free alternatives to wheat, such as pure oats, quinoa, buckwheat, almond flour and coconut flour. There are several alternatives to conventional wheat bread in this article.