 [ Symptoms ] am i short changing myself by exercising early in the morning before i have eaten anything [ Disease ] you need some fuel to get you going and help you feel good about your workout so if you grab a banana a whole grain english muffin or a carton of low fat yogurt on your way to the gym you will likely have a far more enjoyable workout be able to work harder and be less hungry when you are finished if you do not eat something you may become light headed dizzy and wishing you were not exercising  says nancy clark ms rd author of nancy clark is sports nutrition guidebook