How do autoimmune diseases work?
A friend of mine recommended I look into possible thyroid or autoimmune stuff to explain why I can’t gain weight; her daughter was diagnosed with Celiac disease without any prior symptoms other than being skinny despite however much she ate. I doubt I have Celiac (wouldn’t my OBGYN have noticed something in the bloodwork I had while pregnant?) but it got me wondering. Is it like an allergy where the immune system is overreacting?