@imautistic If someone has the autoimmune disease Celiac, or is gluten intolerant (no test for that one), it can impact the ability of your GI tract to absorb calories and nutrients, potentially resulting in malnutrition if not treated (by avoiding all gluten). Because your tests are early stage, your doctors may not have a diagnosis for you yet, but hopefully additional testing will determine if it is celiac, or some other condition that it harming your health. Let us know how things are going. Once you get a final diagnosis, there will still be questions.