Yes!! this is another very Chinese phenomenon, they love to ''Eat'', and they eat at any time all day long!! Which is why ALL the restaurants are open all day long in China and Hong Kong.
As others have mentioned, they get a bit ratty if there tummy is telling them it needs topping up!! haha!! Guess that's why they eat little, but very often throughout the day. Sometimes it only needs to be a bit of fruit like an Orange, Banana etc, but other times it will need to be a bit more substantial...haha!!
I don't know if others have noticed or not, but when i eat Chinese, i'm only full for maybe 2 or 3 hours, then i'm feeling hungry again!! Even noticed this years back, whenever i had a Chinese meal at a restaurant, or a takeaway back in the UK....
David...