A second group, the lacto- vegetarians, includes dairy, but no other animal products in their diets. Any of these diets can be healthy and nutritionally adequate, if you follow proper food planning. But it does take careful planning. Just dropping meat from the diet won't do it. You'll need to pay close attention to those nutrients that are likely to be inadequate unless specially planned for.
Protein is the nutrient that gets most attention in the vegetarian diet.
Good non-meat protein sources include legumes or beans, soy products like tofu, nuts and seeds. Lacto-ovo vegetarians will get lots of high quality protein from dairy products and eggs. Vegetarians who do not consume any dairy products need to pay particular attention to their calcium intake. It is very difficult to get enough calcium without consuming any dairy products. Consult your physician to see if a calcium supplement may be in order.