Dairy doesn't cause IBS-D for me, but mozzarella cheese will get me into -C right quick. Eggs set me off. From the moment I eat them I'll hear my stomach gurgling loudly and then the expected result happens. I've just got a ton of food sensitivities that don't correspond to FODMAP necessarily. Gluten is definitely one of the worst things I could eat. I've been off that since around 2005.