The principle of self-demand feeing--that children can regulate eating naturally by themselves, eating only when they are hungry--comes from Hirschmann's successful workshops. Parents who are at a loss on how to deal with their child's overeating, especially those who struggle with food themselves, will find useful, practical information.
A friend is trying the method in this book for her daughter. I read it with interest, but decided against it, because the majority of food and drink that's proffered in our society is stuff I'm unwilling to let my kids gorge on, even temporarily.