Girl, if he broke up w/ you cuz he didn't like how you look, he's a jerk and you're good to be rid of him. It is never good to go w/o eating. Vitamins will give you specifically the minerals you need, but energy can only come from actual food, and w/o energy your body will shut down. It will think you are starving, and so then your metabolism will slow down in order to conserve energy. A slow metabolism means no weight loss. Just eat balanced, proportional meals, and exercise.