hi hun theres no way of checking only the surgeon can see on the day of the op, the diet is designed to shrink the liver so its easier for the surgeon to do the op, the surgeon is the only one that can tell what extent each patient has cheated by how fatty the liver is once the op has begun, becareful and try not to cheat for the remaining time as it has been known for people to wake up and there ops havent been done due to a fatty liver, stay strong you should be ok if you stick to the diet sheet between now and the op x