Being a vegetarian ain't easy and dieting one is even harder!
I follow a mostly low carb diet so you can imagine how hard it is for me.
I have found that a lot of trial and error is the best thing when it comes to diet.
I would recomend the following foods:
Protein shakes
Tofu (check the type, this can be a bit tricky, some tofu can be very high in fat/cals)
Low fat dairy
Whole grains such as porridge/brown bread/pasta
Meat subsitutes
Do the following:
Plan/prepare meals in advance (this is very important for us veggies for situtations when decent protein sources will not be availble)
Keep a food diary
Allow one treat meal a week
Find a form of exercise you like
Good Luck

