My first thought was that the opposite was true. The immune system attacks healthy cells, increasing inflammation, thus stress. Thereby lowering the normal immu

My first thought was that the opposite was true. The immune system attacks healthy cells, increasing inflammation, thus stress. Thereby lowering the normal immune system and allowing cancer cells to flourish. Unless you're talking about all-encompassing diseases (I can't think of any off the top of my head). Otherwise, I don't think Celiac/MS/Diabetes is fighting any cancers.