Kelly, as long as you have the right PP balance of carbs and protein it works fine. Have you checked on the PP site and/or read the book? There are some great PDFs that give the basics of the plan (as well a plan review on this site). I tend to graze a lot myself and have found that as long as I hit my DAILY mark for protein and carbs it works well.

Keep in mind, I wouldn't consider this plan so much for rapid weight loss as for health and body balance, but there are plenty of people who've successfully lost weight on this plan and I believe in it enough to encourage you to try it. Good luck!