your sinuses inflamed because you are allergic to something you are eating. when you don't eat you can actually breathe. again it is inflammation killing us. getting rid of the main inflammatory foods are going to help you.. i bet if you ate gluten or dairy you would flame up right?
you should read my fasting Ebook in my signature, i detail many fasting protocols
inflammation affects us different..some people bloat, some people have a harder time breathing, some people end up with interal diseases like cancer, diabetes, heart disease etc. sometimes the inflammation we don't see is the worse .. also unfortunatley steroids are inflammatory in the body, that is an extra good reason to eat healthy as roid users