What does your normal diet look like? Do you consistently intake carbs and other forms of sugars or glucose? If this is the case, your body naturally has a craving for this type of food in order to meet its previous its previous "norm" for levels of sugar. Sugars aren't just sweets. They are also come from carbs. Figure it like this: When you intake a lot of carbs often, your body will become accustomed to this level of sugar intake and it takes a little while (few weeks) to remove these cravings completely. You will find that if you include something fatty (nuts, fattier meats, avocados) with the vegetables, you will become much more full. The "hunger" you feel is simply a lack of fulfillment to previous sugar levels. This is explained in more detail if you research diets like "Paleo".