At three and a half, parents have to be fairly involved because she still lives very much in the moment - how she'll feel later has less of an impact. I've started explaining to Elizabeth that eating too much candy will make her feel yucky, so she can only eat a bit at a time, and never before lunch. Over the next few years, we'll start encouraging her to self-regulate a bit, but I don't think I'm going to let her keep it in her bedroom for a very long time yet.