I was surprised when my Cutie^Princess[ keeps repeating this in mandarin. I asked her where she learn this from and she said that is taught by her teacher. In fact there is actions too which I find it very cute, but she didn't do it on this video.
I think it is a good way to educate children to eat more vegetables by using songs or rhymes. In fact, I realised this year in Nursery two, she eats more vegetables compared to previous.
Conversion from Mandarin to English:
Eat green vegetables,
Body becomes healthy,