Actually, somewhere I read that we're supposed to have 4.5 servings of veg a day!
Might be in the post from ADDFlower from the SBD website?
Anyways, Bunna, I have the same problem. I find that it's really hard to get those extra veggies in, but I just force myself. If I find that I am really full, I think that forcing more food in is developing bad habits (or enhancing my old bad habits), so I don't. But if I am thinking of eating dessert or more protein, I make myself eat more veggies first. Does that make sense? I also try to add more veggies to the things I make. For instance, a couple weeks ago, I made mac n' cheese with WW noodles. To stretch it farther, I added peppers, onions, mushrooms, and broccoli.
I find that adding in veggies as a side when I would normally add a starch helps too. We had hamburgers for dinner on Saturday, and had a cold veggie salad and three bean salad with it instead of whatever we normally would have had. But I didn't finish the veggies...I was too full from the burger!
Just try to get as many in as you can. Try to have a veggie with at least one snack...that will help, too. And take vitamins just in case you don't get all you need.
I think it's great that you are thinking about this!