I have learned that sugar is a big contributor to how I feel everyday. An autoimmune disorder can cause me to feel fatigued and sometimes worn out. Sugar can add to my feeling of fatigue. I have learned that I need to cut out anything that is going to contribute to that feeling. My diet is the best place to start.
Brain fog is not a medically recognized term but is a commonly used phrase that sums up feelings of confusion, forgetfulness, and lack of focus and mental clarity. Having brain fog is fairly common, but it's not normal.