I wonder if it is a good approach to force children to finish their plates?

Seems like not. There are some studies [0][1][2] that show parental control over food intake may result in children's (mostly girls') obesity since it teaches children to ignore their satiety/hunger mechanism and thus overeat.

It may lead to the situation that once grown up, they could keep this habit of leaving the plate empty no matter how full they feel.

[0] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2045650/

[1] https://www.ncbi.nlm.nih.gov/pubmed/11358344

[2] http://www.dailymail.co.uk/femail/article-2384361/Leading-nu...