Any time you change your diet, it will effect your body in different ways. When becoming a vegetarian, it's important to do research to make sure you get enough protein in your diet. You can get it from many different sources: Yogurt, cheese, beans, soy products,whey protein powder (put in smoothies, oatmeal, pancakes,etc.). Taking a vitamin supplement is also a good ides. You need to get iron from veggies like spinach. Good luck!