You will know when u are in the green zone, I wondered the same thing "how will I know" well after my last fill which I am now at 5cc with a 10cc band I can tell a huge difference. I almost thought I needed some taken out because of the amount of restriction but gave it a couple weeks to see if I could handle it, that was on August 22, 2012 and just like I thought it seems to be ok so far. I have lost 12 more pounds since then which brings my weight loss since surgery on May 21,2012 to 48 pounds. It's amazing! Good luck!