3. Trouble concentrating
Right along the same lines as the headache, you may find that your mind isn’t functioning properly. If your brain isn’t getting the glucose that it needs, in the right form that it needs, it can put you in a fog or make you feel confused. Most commonly, this presents as an inability to concentrate.
You may find yourself reading the same page in a book over and over, or trying to figure out where you left off on a work project you were in the middle of.