You might look into Atkins for life. If you are playing Lacrosse and regularly working out, you can probably handle higher carbs.

Check out the recipe foums on here, and also check online for low carb vegatarian recipes. You will need to make sure to get protien, so probably soy beans in various forms and tofu.

Try the mock mac and cheese. It's a tofu base, but it's amazing. I don't make it b ecqause it's so addicting I want to eat it all in one setting.