As long as it's natural peanut butter.
Nellie - Aim for 4 1/2 cups of veggies a day. That will help fill you up. I like to use black beans on stuff and that is filling too. I mixed a can of black beans with a can of diced tomatoes and a bit of chipotle pepper and melted some cheese on top and got several lunches out of that this weekend. That is filling. Salads alone never fill me up.