I have always had my meal requests honored. Note that the breakfast served before arrival is apparently not considered eligible for a special meal. Even though the dinner and snacks conform to special requests, the breakfast usually served are the normal breakfast. This issue has never been addressed to my satisfaction. I have learned to accept it and pick at what I am given. I also bring some nuts and dried fruit with me (don't forget any such food must be consumed before deplaning in the EU due to agricultural customs restrictions.)

Double-check your meal requests 96-72 hours prior to departure (I believe 72 hours is the latest time your request is guaranteed to be honored.)