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Gluten free diet. Avoiding any foods that contain wheat, barley or rye. You should also avoid oats until at least a year after starting the gluten free duet to allow the gut to heal and then only try oats labelled gluten free. A low FODMAP diet would also help in the early stages after diagnosis and most celiacs are lactose intolerant at least until the gut is healed. But FODMAPs and dairy can be gradually reintroduced to check tolerance levels. I would recommend people check out paleo, paleo autoimmune protocol and gaps diets as none of these contain grains. A sugar overload can also cause gluten-like symptoms because it can inflame the digestive system so avoid overly processed gluten free junk food options as they have a higher sugar content than their gluten versions.