I am nearly 6 weeks post op and I get my first fill on the 16th. I can tell you the half cup doesn't work for me right now. I tried and tried and my blood sugar would drop till I got sick. I am cutting back now so I have an easier time adjusting to my half cup after I have a fill, but until this week I have pretty much given up on the half cup at a time. Some people may be able to do it, but I can not do a half a cup at a time with no restriction. I don't eat anywhere near as much as I used to, but I do more than half a cup.