If you're a vegetarian you need to provide your body with foods that contain the essential amino acids that are used as building blocks of protein in the body. Every time you eat food of any kind your body breaks it down into three basic groups.
Nutrition tips - Food weight equivalent to calorie count: AVOID empty calories! The key point is the amount of Nutrients (specially Phytochemicals) per 200 calories. Broccoli and Mini Peppers probably have the most nutrients on this list.