I have Crohns. Removing grains and gluten really helps with overall pain and fatigue. The SCD diet is a bit complicated but its been recommended for Crohns and other autoimmune disorders. http://www.pecanbread.com/ Is a good place to check out. Dairy could also be a problem, especially lactose (milk sugar) and casien (milk protein). Monosacciride sugars like honey and fructose in fruits don't seem to cause too much damage and are allowed on the diet. Although the sugars should still be kept to a low amount so you don't go over 150 g of carbs a day.