Alone in veg-land

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i am due to be married this September to a wonderful carnivore who has no intention of giving vegetarianism any headroom. My step daughter (age 18) is hooked on a Starbucks-only diet and my son (age 13) loves pizza and anything that comes in a crinkly package.
I've heard it said that vegetarian's tend to put weight on due to the fact that they rely on cheese and pasta as staples. I don't, for that reason, but now I find I am hungry...a lot.
What are some of your staples/favorites?