Eating nothing all day, then eating a normal size supper/dinner is not a good idea. Reason being, the larger period of time your decide to stay hungry your body starts to use up stored fat/ energy such as carbs, but when you suddenly eat a lot later on, your body stores a lot of the nutrients to replenish the ones you lose before. You pretty much go nowhere and might even get more out of shape. My advice is to stop going on a "DIET" and consider it a "Life style change" where you just watch what you eat and have a good balance of exercise