Well, for instance, the other night he was going to make burritos for dinner. He eats a lot of pre-packaged instant foods, and he had some red beans and rice Rice-a-roni, and he's cooking it up, and it's almost ready, and I ask if he's looked at the ingredients. So I look at it and it has beef fat in it. Ugh. Why there is beef fat in an innocent package of red beans and rice I don't know. But the moral of the story is to always, always, always check the label if you're buying something that has one. Depending on what you're in the habit of eating, it can be very frusturating at first, because you'll find meat products in things that really shouldn't have them in it. But you'll get to where you know which things to avoid and what's ok. Or, if you don't eat much "convenience food" it might not be a problem. But as a general rule of thumb, if it has a label, check it. Remember that gelatin is an animal product (it's protein that's been boiled out of animal tissues) and it's often in things that otherwise seem ok. There's another thing, I can't remember the name of it right now, but it's the last ingredient in Minute Maid pink grapefruit juice, that you may want to avoid, it's crushed-up insect bodies. I'll try to get the word for it and post. I was drinking that stuff occasionally at work until a few months ago and I read somewhere what it was. Ew! But I guess vegetarians don't necessarily have to avoid insects????
The only other advice I can think of is to ask when you go out to eat whether there is meat in what you're eating. Some restaurants put it in the craziest foods, but mainly things like beans, greens, and soups. But if it's possible that there's meat in it, it doesn't hurt to ask. And usually waiters are pretty accustomed to people with specialized diets asking about menu items, so it shouldn't be a problem.
I know this sounds like a lot of work, but after a while it becomes second nature. At least you'll know what you're putting in your body! Good luck

Erin